delivered the opinion of the court.
The record suggests many questions of law, but the only one that may be considered by this court is whether the proceedings against the plaintiff in error were consistent with the provision in the Constitution of the United States forbidding the States from passing ex post facto laws.
Thompson was indicted in the St. Louis Criminal Court at its November term 1894 for the murder, in the first degree, of one Joseph M. Cunningham, a sexton аt one of the churches in the city of St. Louis. Having been tried and convicted of the offence charged, he prosecuted an appeal to the Supreme Court of Missouri, and by that court the judgment was reversed and a new trial was ordered.
State
v.
Thompson,
132 Missouri, 301. At the second trial the accused was again convicted ; and a new trial having been deniеd, he prosecuted another appeal to the Supreme Court of the State. That court affirmed the last judgment, and the present appeal
*381
brings that judgment before us for reexamination.
State
v.
The evidence against the accused was entirely circumstantial in its nature. One of the issues of fact was as to the authorship of a certain prescription for strychnine, and of a certain letter addressed to the organist of the church containing threatening language about the sexton. The theory of the prosecution was that the accused had obtained the strychniné specified in the prescription and put it into food that he delivered or caused to be delivered to the deceased with intent to destroy his life. The accused denied that he wrote either the prescription or the letter to the organist, or that he had any connection with either of those writings. At the first trial certain letters written by him to his wife were admitted •in evidence for the purpose of comparing them with the writing in the prescription and with the letter to the organist. The Supreme Court of the Stаte, upon the first appeal, held that it was error to admit in evidence for purposes of comparison the letters written by Thompson to his wife, and for that error the first judgment was reversed and a new trial ordered. 132 Missouri, 301, 324.
Subsequently, the general assembly of Missouri passed an act which became operative in July, 1895, providing that “ comparison of a disputed writing with any writing proved-to the satisfaction of the judge to be genuine shall be permitted to be made by witnesses, and such writings and tho evidence of witnesses respecting the same may be submitted to the court and jury as evidence of the genuineness or otherwise of the writing in dispute.” Laws Missouri, April 8, 1895, p. 284.
This statute is in the very words of .section 27 of the English Common Law Procedure Act of 1854,17 & 18 Vict. c. 125. And by the 28 Vict. c. 18, §§ 1, 8, the provisions of that act were extended to criminal cases.
At the second trial, which occurred in 1896, the letters written by the accused to his wife were again admitted in evidence, over his objection, for the purpose of comparing them with the order for strychnine and the letter to-the *382 organist. This aсtion of the trial court was based upon the above statute of 1895.
The contention of the accused is that as the letters to his wife were not, at the time of the commission of the alleged offence, admissible in evidence for the purpose of comparing them with other writings charged to be in his handwriting, the subsequent statute of Missouri changing this rule of evidence was ex postfacto when applied to his case.
It is not to be denied that the pоsition of the accused finds apparent support in the general language used in some opinions.
Mr. Justice Chase, in his classification of
ex post facto
laws in
Calder
v.
Bull,
In
Kring
v. Missouri,
In the opinion of the court in
Kring’s ease
reference was made to the opinion of Mr. Justice Chase in
Calder
v.
Bull,
and also to the charge of the court to the jury in
United States
v.
Hall,
A careful examination of the opinion in Kring v. Missouri shows that the judgment in that case proceeded on the ground that the change in the law of Missouri as to the effect of a convictioñ of murder in the second degree — the accused being charged with murder in the first degree:— was not simply a change in procedure, but such an alteration of 'the previous law as took from the accused, after conviction of murder in the second degree, that protection against punishment for *384 murder in the first degree which was given him at the time of the commission of the offence. The right to such prоtection was deémed a substantial one —- indeed, it constituted a complete defence against'the charge of murder in the first degree — that could not be taken from the accused by subsequent legislation. This is clear from the statement in Kring’s case that the question before the court was whether the statute of Missouri deprived “the defendant of any right of defence which the law gave him when the act was committed so that as to that offence it is ex post facto”
This general subject was considered in
Hopt
v. Utah,
This court said: “ The provision of the Constitution which prohibits the States from passing
ex post facto
laws was examined in
Kring
v.
Missouri,
At the present term, in
Thompson
v.
Utah,
Applying the principles announced in former cases — without attaching undue Aveight to general expressions in them that go beyond the questions necessary to be determined — Ave adjudge that the statute of Missouri relating,to the com *387 parison of writings is not ex post facto when applied to prosecutions for crimes committed prior to its passage. If persons excluded, upon grounds of1 public policy, at the time of the commission of an offence, from testifying as witnesses for or against the accused, may, in virtue of a statute, become com-, petent to testify, we cannot perceive any ground upon which to hold a statute to be ex post facto which does nothing more than admit evidence of a particular kind in a criminal case upon an issue of fact which was not admissible under the rules of evidence as enforced by judiсial decisions at the time the offence was committed. The Missouri statute, when applied to this case, did not enlarge the punishment to which the accused was liable when his crime was committed, nor make any act involved in his offence criminal that was not criminal. at the time he committed the murder of which he was found guilty. It did not change the quality or degree of his offence. Nor can the new rule introduced by it be characterized as unreasonable— certainly not so unreasonable as materially to affect the substantial rights of one put on trial for crime. The statute did not require “ less proof, in amount or degree,” than was required at the time of the commission of the crime chargеd upon him. It left unimpaired the right of the jury to determine the sufficiency or effect of the evidence declared to be admissible, and did not disturb the fundamental rule that the State, as a condition of its right to take the life of an accused, must overcome the presumption of his innocence and establish his guilt beyond a reasonable doubt. Whether hе wrote the prescription for strychnine, or the threatening letter to the church organist, was left for the jury, and the duty of the jury, in that particular, was the same after as before the passage of the statute. The statute did nothing more than remove an obstacle arising out of a rule of evidence that withdrew' from the consideration of the jury testimony which, in the opinion of the legislature, tended to elucidate the ultimate, essential fact to be established, namely, the guilt of the accused. Nor did it give the prosecution any right that was denied to the accused. It placed the State and the accused upon an equality ; for the rule established by it gave *388 to each side the right to have disputed writings compared with writings proved to the satisfaction of the judge to be genuine. Each side was entitled to go to the jury upon the question of the genuineness of the writing upon which the prosecution relied to establish the guilt of the accused. It is well known that the adjudged cases have not been in harmony touching the rule relating to the comparisоn of handwritings: and the object of the legislature, as we may assume, was to give the jury all the light that could be thrown upon an issue of that character. We cannot adjudge that the accused had any-vested right in the rule of evidence which obtained prior to the passage of the Missouri statute, nor that the rule established by that statute entrenched upon any of the essential rights belonging to one put on trial for a public offence.
Of course, we are not to be understood as holding that there may not be such a statutory alteration of the fundamental rules in criminal trials as might bring the statute in conflict with the ex post facto clause of the Constitution. If, for instance, the statute had taken from the jury the right to determine the suffiсiency or effect of the evidence which it ■made admissible, a different question would have been presented. We mean now only to adjudge that the statute is to' be regarded as one merely regulating procedure and may be applied to crimes committed prior to its passage without impairing the substantial guarantees of life and liberty that are secured to an accused by the supreme law of the land.
The judgment of the Supreme Court of Missouri is
Affirmed.
