By the Court—Gilbert, J.

The determination of this case depends upon the construction which shall be given to *18the deed from Jacob Storms and wife to the plaintiff, dated May 1, 1863. The only subject in dispute is the southeastern boundary described in that deed, the description of which is as follows: “ Thence south to the center of the mill creek or Pocantice river, thence easterly along the center of said creek or river to the present mill-dam at the center thereof, thence through the center of said mill-dam and the center of the mill-pond to the late Highland turnpike road.” The deed also conveys the lands covered by the waters of that portion of said mill-pond thereby conveyed, as the same were conveyed to the said Jacob Storms and others by Francis Core and wife by deed, dated January 21, 1856. The deed from Storms and wife to the plaintiff is executed by the grantee as well as the grantors, and contains the following covenant: “ And the said party of the first part hereto does covenant and agree for himself, his heirs and assigns, that he nor they will not at any time hereafter encroach upon the southeasterly half of said pond still owned and retained by him, by walling, filling up or otherwise, but that there shall be preserved at all times in said south-easterly half of said pond a water surface equal to the surface hereby conveyed to the said party of the second part; and the said party of the second part does hereby in like manner covenant that he will not at any time in anywise encroach upon the north-west half of said pond hereby conveyed to him, but that the water surface therein shall at all times remain equal to the water surface in the south-east half of said pond.” The only difficulty in the case arises from the omission in the deed of any words pointing out the course of the line running through the pond, and the spot where that line meets 'the Highland turnpike road. These particulars not being in terms defined by the deed must be ascertained by applying the rules governing the interpretation of such instruments, which are these: If the language of the instrument is susceptible of more than one construction, the intent of the parties to be collected from the whole instrument must govern; and, in order to ascertain that intent, the court may take into consideration the extrinsic *19circumstances attending the transaction, the situation of the parties and the subject-matter of the instrument. This is the established rule of the common law, and in respect to conveyances of real estate has been declared by statute. (French v. Carhart, 1 Comst., 102; 1 R. S., 748, § 2.) Ho evidence to contradict the instrument can be admitted, but evidence for the purpose of explaining it is sometimes admissible.

Where a line is given in a deed as running from one monument to another, it is always presumed to be a straight line, unless a different line is described in the deed, so that by ascertaining the monuments at. the angles of a parcel of land, the boundary lines can at once be determined. (Allen v. Kingsbury, 16 Pick., 238, 239 ; Wash. R. P., 631.) In this case the deed to the plaintiffs calls for a line running from the center of the mill-dam through the center of the millpond to the road. The direction of this line will be fixed when it is ascertained what is meant by the words “ through the center of the mill-pond,” and when fixed will determine whether the locus in quo is embraced within it or not. We think the deed itself furnishes evidence which makes it reasonably certain that the partiés intended a line which should divide the water surface of the pond, as it was when Core was the owner, equally. The grantors convey the lands under water as the same were conveyed to them by Core and wife, and the parties mutually covenant in substance that an equal water surface shall always be preserved on each side of said line. The conveyance from Core and wife to Storms was made seven years before the deed to the plaintiff. Any change in the pond, produced while Storms was the owner, therefore, cannot affect his grant to the plaintiff. The line in question is described in both deeds in the same language. The deed from Core and wife to Storms also conveys the lands covered by the portion of the mill-pond thereby conveyed. It furthermore recites an agreement between the parties that the grantors are to sell “ the other and southerly half of said mill-pond,’' and contains a mutual covenant that the owner of eacli half *20of the mill-pond shall hear one-half of the expense of main taining the dam, and shall use only one-half of the water of the pond. The deeds under which the defend ants claim title all ' contain corresponding provisions and covenants with respect to the northerly half of the pond, and are made in terms subject thereto. It would be extremely difficult to reconcile the language used in these deeds with any different construction than that which we have expressed. The correctness of this construction is also shown by the map and survey put in evidence, showing the actual location of the line through the pond. This map was made for, and is mentioned in the deeds of the respective parcels from, the former owner of the whole premises under, which the plaintiff and defendants respectively derive their title, and, we think, was properly received in evidence, for the purpose of showing the actual location of that line. “ If I. S.. be seized of the manors of A. and B., and cause a survey to be taken of B., and afterward convey it to I. N., and after disputes arise between the lords of the two manors.concerning the boundaries, this survey may be given in evidence. Aliter if the two manors had not been in the same hands at the. time of the survey taken.” (B. N. P., 283; 1 Gr. Ev.,.§ 189; Bridgman v. Jennings, 1 Ld. Raym., 734; Doe dem. Hughes v. Lakin, 7 C.& P.,481.)

The rule contended for by the counsel for the defendants, .that a grant of land bounded upon a stream extends, to the middle thereof, has no application to this, case. That rule'.can be applied only when the grant is in terms bounded upon the pond or the stream which runs, through it generally. In such a case, it will be extended to the center.or thread of the.streana. But .such rule, being founded upon the presumed intention of the- grantor, can never, even in. such.a. case, be applied when such presumption is repelled by the language.used in the conveyance. (Child v. Starr, 4 Hill, 373; Herring v. Fisher, 1 Sand. S. C. R., 348; id., 323; Bissell v. N. Y. C. R. R. Co., 23 N. Y. R., 64; Bradley v. Rice, 13 Me., 201.) In.the case before us,, as we have seen, there is no boundary, on the pond generally, *21but the line through the pond is to run straight from the dam to the road, and necessarily excludes any intention of the grantor that it should follow the course or channel of the stream. Such, evidently, was the view of the subject taken by the defendants themselves, at the time the deeds to them respectively were made, for in those deeds the line through the pond is in terms described as a straight line. The evidence si iows that the line established by the referee is in accordance with the construction which we have given to the deed to the plaintiff, or at least that such line does not encroach on the southerly half of the pond. It cannot he doubted that it was competent to prove this fact by paroi evidence. (1 Gr. Ev., § 301.) It is, therefore, immaterial whether the referee was right or wrong in admitting the paroi testimony to which the defendants objected, or in the process of reasoning by which he formed his conclusions upon the whole evidence; for such errors are only presumptively injurious, and when it appears on an examination of the whole ease that the result ought to have been the same if the errors had not been committed, the errors furnish no ground for reversing the j ndgment. (People v. Gonzalez, 35 N. Y., 59.)

The judgment therefore must be affirmed, with costs.

Judgment affirmed.