Boyd, C. J.,

delivered the opinion of the Court.

The appellee filed a bill in equity against the appellant for the specific performance of a contract to purchase a property on the west side of South Potomac Street in Hagerstown. The appellant filed an answer in which it stated that it wanted the property, and was ready and willing to pay the balance of the purchase money if the appellee could convey such an estate in the property as is required by the agreement, but alleged that he could not do so. The Circuit Court for Washington County decreed specific performance by the appellant as prayed for in the bill, and from that decree this appeal was taken.

George Brendel, by his last will and testament, which was probated the 14th day of August, 1855, left to his daughter, *408 Elizabeth G. Smith, a lot on South Potomac Street and all of his personal property. He directed his executor to rent out all of the rest of his real estate for such a length of time as was required to raise from the rents the sum of $1,200.00, which sum he gave to his daughter for the purpose of aiding her in erecting a comfortable home on the lot lie devised to her. He then gave her $250.00 which was to be paid by charging her with the appraised value of the personal property he had left her and paying the balance oxit of the rents of the real estate after the $1,200.00 had been realized.

The next items in the will are as follows:

“Item. I give and devise to my son, Henry G. Brendel, to hold in trust for his children that may be living at the time of my death, the first choice of all my houses and lots, except the one I have herein devised to my daughter Elizabeth (the two houses on Antietam street are to be considered one property), and the said property so selected by my said son Henry, as trustee for his said children, shall be given over to him, my said son, after the money, which is to be paid to my said daughter Elizabeth, shall have been raised out of the rents of my real estate as aforesaid.

Item. I give and devise to my daughter, Catherine Hammer, the second choice of my houses and lots, she to have possession of the same when a sufficient amount' shall have been raised from the rents as aforesaid to be paid to my said daughter Elizabeth, said property so selected by my said daughter Catherine shall be held by her during her natural life, and after. her death to go to her children, share and share alike.

Item. I give and devise my remaining house and lot, that is the one that will be left after my son Henry as trustee aforesaid, and my daughter Catherine shall have respectively selected theirs as aforesaid, to my son John’s two children, their heirs and assigns, forever, my said grandchildren to get possession of their property when a sufficient amount has been raised from the rents for the purposes aforesaid, as in the case of my son Henry and daughter Catherine.”

On the 3rd day of June, 1905, Annie A. Gray and husband, Mary E. Brendel, Eranklin A. Brendel, Graves S. Brendel and wife, and Charles H. Brendel and wife, who *409 are described in the deed as “being the heirs at law of Henry G. Brendel, late of Washington County,” conveyed the property in controversy to the appellee. The answer of the defendants gives as reasons why the plaintiff could not convey such an estate as is required by the agreement between them the following: («•) Because the above-named grantors are not all of the children of Henry G. Brendel, deceased, who were living at the time of the death of George Brendel, and the descendants of such children; (b) Because Henry G. Brendel, trustee, never made a legal and proper choice and selection of the property mentioned in the bill of complaint from and among the three separate properties left and devised by George Brendel, as required and directed by the will; (c) Because, no legal and proper choice or selection being made, the title to the property would likewise he in Catherine Hammer and John Brendel’s two .children, as well as in the said Henry G. Brendel, trastee; and (d) Because the trust is still existing.

The first objection (a) was abandoned by the appellant, and the testimony shows that all of the children of Henry G. Brendel, living at the time of the death of George Brendel, united in the deed. We will consider objections (&) and (c) together.

At the time of the death of George Brendel he owned what he treated as four pieces or parcels of ground, — one being the south half of Lot Ho. 130 on South Potomac Street, which he left’ to his daughter, Elizabeth G. Smith, another being the north half of that lot, and being the property in controversy; another consisting of two houses on Antietam Street, which the testator said were to be considered one property, and the other on the Williamsport and Hagerstown Turnpike, now known as Jonathan Street. The testator died in 1855, and Henry G. Brendel died in 1890.

The theory of the appellant is that as the will did not designate what particular property the respective devisees should, take, they were tenants in common of all of them, and hence *410 there should have been a deed of partition, or a deed from each two of them to the third. But it is clear from the will that the testator did not intend that they should be tenants in common — on the contrary, he said that Henry G. should hold the lot he selected for his children living at the death of the testator, that Catherine should have the one of the two remaining lots which she selected and the two children of his son John should have the other one. There can be no doubt about the right of Henry to make the first choice, and it becomes in reality a question of what is sufficient evidence of his choice, and not the right to malee it. The first choice was a right that Catherine and John’s two children could not deprive him of, and could not well aid him in. The testator did not devise the three lots to Henry, Catherine and John’s two children, with direction that they should divide them between themselves, giving Henry the first and Catherine the second choice, but he gave to Henry, to hold in trust for his children, “the first choice” of all his houses and lots (except the one devised to Elizabeth), “and the said property to selected by my said son Henry, as trustee for his said children, shall be given over to him ” after the money was raised out of the rents of the real estate for Elizabeth, and he g*ave to Catherine the second choice of his “houses and lots, she to have possession of the same when a sufficient amount shall have been raised from the rents as aforesaid.” The gift to John’s two children shows still more clearly that they were not intended to be tenants in common, for all that he gave them was “my remaining house and lot, that is the one that will be left after my son Henry, as trustee aforesaid, and my daughter Catherine shall have respectively selected theirs as aforesaid” — they “to get possession of their property when a sufficient amount has been raised from the rents for the purposes aforesaid, as in the case of my son Henry and daughter Catherine.” In a word, he gave one property to each.

*411 The testator apparently intended that the property should remain in the executor until the money for Elizabeth was raised, and then he was to turn over the possession of the one selected by Henry to him, of the one selected by Catherine to her and the remaining one to John’s two children. It might have been better for the executor to have placed on the land records some statement or declaration showing what selections had been made by Henry and Catherine, but while that might have been more satisfactory evidence of the selection by them, it was not the only evidence by which the selection can he shown.

It was suggested in the appellant’s brief that if Henry had refused to make first choice, he could have prevented any of the parcels from ever vesting in Catherine or John’s children, and that if Henry did make his selection hut Catherine had refused to make the second choice she could have prevented either of the two remaining parcels from vesting in John’s children. But, although such a contingency was not likely to arise, as Henry had the first choice, if he had refused to make it after the money for Elizabeth had been raised, he could have been compelled to make the selection within a reasonable time, and upon failure to do so a Court of equity could have given the other parties ample relief, and so in the case of Catherine, as affecting John’s children. The testator manifestly intended that each of the three should have one of the lots, and if those having the first or second choice refused to exercise it, the Court could either have made it for them or at least have protected the other devisees.

In Bouvier’s Law Dielionary “election” is defined “choice, selection,” and “The obligation imposed upon a party to choose between two inconsistent or alternative rights or claims, in cases where there is clear intention of the person from whom he derives one that he should not enjoy both.” We do not understand it to be claimed by the appellant that the devises to the several devisees were invalid, because the testator did not leave any particular one of the three properties to either of them. Such devises are not void for uncer *412 tainty as to the property because the testator has provided means by which they can be made certain. The maxim “Id cerium est quod cerium reddk potest” is applied to such cases, 1 Jarman on Wills, 362. The devise being valid, and there being nothing on the face of the will from which it can be determined which of the three properties Henry took, under the authority to make the first choice, the question is, what evidence can be used to show what his choice was ? If it be conceded, as it must be, that the testator did all required of him in order to vest title in Henry to one of the three properties, but did not prescribe the character of evidence which should be necessary to show what his choice was, it would be remarkable, and an exceedingly harsh rule of law, if the interests of the children of Henry must be defeated, merely because there is no deed or declaration of Henry or of the executor to him in the land records. It must be kept in mind that the testator did all that was necessary to have the title pass out of him, and we think we have shown that no interest in the lot selected by Henry vested in Catherine or John’s-children, and hence if they had made a deed to Henry it would not have conveyed any interest in that lot.

It cannot be denied that the title to much valuable real estate must depend in part upon parol testimony. If A. dies intestate, leaving children or other heirs, his real estate descends to his heirs, but if they or their assignees institute an action of ejectment, relying on that title, in order to recover they must prove that A. died intestate and who his heirs were. There may be, and often is, no record evidence to prove who the heirs were, and resort is had to parol evidence to establish that, as well as the fact that the ancestor died intestate. Property held by adverse possession is proved the same way, and what is more analogous to this case is where the doctrine of election is applicable. It was said in the opinion of Judge Peioe, adopted by our predecessors in Whitridge v. Parkhurst, 20 Md. 62: “It is certain that an election may be determined by matter in pais as well as by *413 matter of record, but it can only be by plain and unequivocal acts, White's Eq. Ca., Streatfield v. Streatfield, 65 Law Library, 289. It may be either express or implied. Considerable difficulty often arises in deciding what acts of acceptance or acquiescence amount to implied election. This question must be determined more upon the circumstances of each particular case, than upon any general principle. Dillon v. Parker, 1 Swans. 382, note; White's Eq. Ca., 65 Law Library, 27.1, note. To constitute an election there must be a choosing between the two ; the taking of the one and the rejection of the other.” We, of course, understand that the election there spoken of is not precisely the same as the choice, election or selection, whatever it may be called, Henry was to make, but there can be. no more ground for allowing such an election as is referred 'to in that case to be determined by matter in pais than there is for such as there was in this case and it is for that reason we refer lo and rely on that decision as decisive of the right to prove the “first choice” by matter in pais.

What then are the important facts shown in the record? The evidence is that Henry lived in Frederick when his father died, and he moved to Hagerstown in 1871, where he lived in this property until he died in 1890. He collected the rents from it before he moved to Hagerstown, although the evidence does not show just when he began to do so. After his death his widow and at least one of his children continued to live there until the widow's death in 1904. On September 30th, 1863, the executors of Samuel Eichelberger, who was executor of George Brendel, settled an account in the Orphans’ Court of Washington County. They charged themselves with the inventory of personal property of George Brendel amounting to $120.27, also with r-onts received from various parties — amounting in all (including the personal property) to $2,259.67%. They got credit for various sums, including taxes, repairs, etc., leaving a balance due the estate of $1,605.37, which amount was made up of the $120.27 of personal property and $1,485.10 rents from ihe *414 real estate. They distributed “To Elizabeth G. Smith, specific legacy in aiding her in putting up a comfortable house (see will of testator) $1,200.00,” and also $129.73 balance of the $250.00 left her by the will, and then, after paying two notes and an account of Elizabeth G. Smith which the account of the executor states were paid “by agreement of the heirs of decedent (they being all of legal age),” they distributed the balance due, as follows: “And distributed to the following heirs of said deceased, according to the annual rent of the respective real estates they have selected under the will of said deceased,

To Henry G. Brendel, in trust for his children $14.89

Catherine Hammer..................... 16.37

John Brendel’s two children.............. 10.42 $41.68”

Some of those rents were collected as late as July 1, 1863, and therefore it would seem that it took until that time -to collect the amount necessary to pay Elizabeth G. Smith, as directed by the testator. Manifestly the selections were made prior to that time — September 30th, 1863.

The testimony shows that John G. Brendel and Maria A. Minnick were the two children of John Brendel. On February 16, 1866, John G. Brendel and wife and Mrs. Min-nick and husband conveyed to Alpheus R. Appleman the parcel of ground on the Hagerstown and Willamsport Turnpike road, which George Brendel owned. In that deed they recited the will of George Brendel, that Henry and Catherine “did pursuant to the provisions of the said will exercise their several rights of election, and did each of them choose a certain house and lot whereof the said testator died seized and possessed leaving the house and premises hereinafter described which by a further provision in the said will were devised to the two children of Jdhn, the son of said testator,” etc.

On the 14th of November, 1878, the children of Catherine Hammer, and their wives and husbands, conveyed to J. Calvin Hoffman the western part of Lot Ho. 285, fronting on West Antietam street, and the same day they conveyed *415 the eastern part of that lot to J. 0. Dayhoff. The testimony-shows that the Antietam street property went to Mrs. Hammer. On the 14th of May, 1875, P. B. Small, executor of Elizabeth G. Smith, conveyed to Emma S. Dayhoff the property left her by her father, and as we have seen on the 3rd of June, 1905, the children of Henry, the husband of Annie A. and the wives of the others conveyed the property in controversy to the appellee — reciting that it was the same property devised to Henry, in trust for his children, by George Brendel.

It would be difficult to find a case in which the essential facts were more clearly proven, if that can be done, as we hold it can be, by matters in pais. The probabilities are that since the account was settled in September, 1863, the several parties collected the rents from or occupied their respective properties. The evidence shows that such was the case with Henry’s property. As early as February 16, 1866, the children of John conveyed the property which they said was left for them after the other two children of the testator had made the selections authorized by the will. While it is true that recitals in deeds are not always binding on third parlies, such recitals as these would he binding on the children of John, and inasmuch as they conveyed away one of the three properties owned by the testator, they would not be permitted to assert title to either of the others under the will. So with the children of Catherine Hammer, if it becomes necessary to prove the selection by the respective parties of the several lots no stronger or more convincing evidence as to which were selected could well be produced than we have by their deed and other evidence in the case.

But even if the appellant’s contení ion that the devisees were tenants in common were conceded, the facts and the acts of the several parties show conclusively such adverse possession as could bo relied on. It is not the law that there can be no adverse possession by one tenant in common against another, but more evidence is required. “The ouster by a tenant in common, of his co-tenant, does not differ in its *416 nature -from any other ouster, nor in any respect except in the degree of evidence required. The distinction relates to the character of the evidence necessary to prove that the possession was adverse.” 1 Am. & Eng. Ency. of Law, 804. The appellee and those under whom he claims have been in possession of this property for over forty — probably nearly fifty years, and under such circumstances as can admit of no doubt of such an ouster as would effectually preclude the other descendants of George Brendel from recovering any interest in this property. So from either standpoint, although in our judgment they were not tenants in common, there is no doubt about the title being good as against them.

(d) The only other question we are called upon to consider is whether there was still an existing trust. It will be noticed that there is nothing in the will to fix the time Henry should hold the property in trust, nor is there anything defining the trust or stating what he should do, beyond selecting the house and lot for his children. One of them, Miss Mary Brendel, was only five years of age when her grandfather died, and some of the others were doubtless under age, as (he testator had been dead fifty years when the deed to the appellee was made, and all of Henry’s children were still living. The testator may have intended that Henry should hold the property as long as he lived and any of his children were under age, but there is nothing to show that he intended that it should be held in trust beyond his life — -at least if all of his children were of age when he died. All of them were then of age, and there could be no reason for holding it in trust beyond that time. The testator did not make any disposition of it after the death of Henry’s children, did not provide for the survivors having the use of it after the death'of any of them, and did not limit their interests to life estates or other estate less than a fee. When, then, Henry was dead and all of his children were of age, there was no occasion for the continuance of the trust, even if it can be assumed that the testator intended that he should in any way have the benefit of the property during his life.

*417 It was said hy Judge Briscoe in Lee v. O’Donnell, 95 Md. 538: “Row, while it is conceded that the testator did not name or fix any definite period when the trusts created by the aidicle of the will now in dispute should terminate, yet we think it is manifest from a critical examination of the will, that it was not his intention that these trusts should last forever, but they were to cease and have an end. The rule of law" is well settled that where no intention to the contrary appears, tho language used in creating the trust estate will be limited and restrained to the purposes of its creation, and when they are satisfied, the estate of the trustee ceases to exist and his title becomes extinct. The extent and duration of tho estate are measured by the objects of its creation.” Again it is there said: “The nature and duration of a trust estate are to be controlled by the requirements of the trust. The trustees in this case have no interest in the property in question, excepting the holding of the bare legal title, ana there is no duty to be performed by them except to collect and pay over the income to the persons who have the beneficial interest.” As all of the children of Henry were of age when he died, there was no possible reason for the appointment of another trustee, and if one had been appointed there was' nothing for him to do. It would have been an unnecessary and unauthorized burden on the owners. It was said in Thompson v. Ballard, 70 Md. 10, “As the trustee has no active duties of any kind to perform, and there is no longer any title requiring protection by bis retention of the legal estate, the purposes of the trust have been accomplished. It must therefore be declared to be at an end.” See also Long v. Long, 62 Md. 65; Brillhart v. Mish, 99 Md. 458; Brown v. Reeder, 108 Md. 653.

In this case the only active duty the trustee was directed by the will to perform was the selection of the house and lot. He was not instructed to rent the property or told what' use should he made of it. At least as soon as it was selected, the children of the trustee had a vested estate in fee — there being nothing in the will to limit it to a less estate. Certainly *418 since 1890, if not since the selection of the property was made, under the Statute of Uses the use was executd in the cestuis que trustent, and the legal, as well as the equitable, estate became vested in them. That is so thoroughly settled by the decisions of this Court that we will without further discussion of the subject simply refer to some of them. See Ware v. Richardson, 3 Md. 547; Hooper v. Felgner, 80 Md. 271; Numsen v. Lyon, 87 Md. 41; Graham v. Whitridge, 99 Md. 292; Prince de Bearn v. Winans, 111 Md. 474. In view of the conclusion we have reached as to the trust, it is unnecessary to refer to the deed made to the appellee by Charles H. Brendel on December 8, 1909, which purported to convey the legal title to this lot.

It follows from, what we have said that in our judgment the appellee can convey such a title as the agreement calls for. It was said in Levy v. Iroquois Co., 80 Md. 304: “The purchaser has the right, we have said, to demand a title which shall enable him not only to hold his land, but to hold it in peace; and one so clear of doubt as will enable him to sell the property for its fair market value. At the same time it is not every doubt, or suggestion, or even threat of contest that will be sufficient; otherwise an assailing purchaser might in every case raise or make such an objection. And to avoid this the rule is now well settled, that the doubr must be a reasonable doubt, and' one sufficient to cause the Chancellor to hesitate, whether the purchaser should be obliged to complete the contract of sale.” The title in this case is not only free from reasonable doubt for other reasons we have given, but it has .been so held by the appellee and those under whom he claims for about half a century as to make it as safe as any title can well be. In this State purchasers may be required to take titles depending upon adverse possession. Lurman v. Hubner, 75 Md. 268; Bay v. Posner, 78 Md. 42.

Decree affirmed, the costs to be paid by the appellant.