¶1after stating the case, delivered the opinion of the Court.
¶2
¶3
¶4In this connection the court instructed the witness to express the opinion formed by him with reference to his observations of defendant up to and including the time he last saw him. The witness answered in conformity with this direction, expressing the opinion as still retained by him. Fault is found with this action of the court, counsel for defendant contending that the witness should have been allowed to state his opinion as to the mental condition of defendant at the time of the shooting. Here again we think the court was right, because the nonexpert witness should always speak as of the time of his observation. To have allowed this witness to do otherwise would be equivalent to permitting him to give an opinion upon the character of the mental disease, and as to whether it probably continued up to the date of the shooting. The witness could not speak of a condition he did not observe, nor should he be permitted to express an opinion as to the temporary or permanent nature of the disease. This is the province of the expert. (1 Clevenger Med. Jur. of Insanity 588; Blake v. Rourke, 74 Iowa 519, 38 N. W. 392; Denning v. Butcher, 91 Iowa 425, 59 N. W. 69.)
¶5On cross-examination the witness was asked to tell the jury what he meant by “insanity” and “unsoundness of mind.” The court directed him to answer. This he did, explaining in his own way what meaning he attached to those terms. There was no attempt to compel him to , give a technical definition of them, nor to confuse him by questions pertaining to technical distinctions. This was clearly within the range of proper cross-examination.
¶6
¶7Counsel were not compelled to so frame their question as to embrace in it a statement of all the elements of the law of insanity. Capacity to distinguish between right and wrong with reference to the particular act in controversy is certainly a prerequisite to legal responsibility, and whether or not the defendant possessed such capacity was necessarily a subject of legitimate inquiry in the trial of this case. If he did not possess it, he could not properly be convicted of any degree of homicide. Counsel were properly permitted to direct their inquiry in such a way as to develop proof tending to show the degree of intelligence possessed by the defendant under the particular circumstances. If they choose to limit the inquiry to .this particular point, and there stop, it was not error in the court to permit it. It was for the court to state the law applicable to this defense upon the facts as they were presented.
¶8
No. 36. “You are instructed that if, from all the evidence-in the case, you believe, beyond a reasonable doubt, that the defendant committed the crime of which he is accused, in manner and form as charged in the information, and that at the time of the commission of such crime the defendant knew that it was wrong to commit such crime, and was mentally capable of choosing either to do or not to do the act or acts constituting such crime, and of governing his conduct in accordance *369with such choice, then it is your duty, under the law, to find him guilty, even though you should believe from the evidence that at the time of the commission of the crime he was not entirely and perfectly sane.”
No. 37 “You are instructed that, in order to be criminally responsible, a person must have intelligence and capacity to have criminal intent and purpose; and if his mental powers are so deficient that he has no will, or no conscience, or no controlling mental power, or if, from the overwhelming violence of mental disease, his intellectual power is, for the time, obliterated, he is not criminally responsible, — the question to be determined being whether, at the time of the act, he had the mental capacity to entertain a criminal intent, and whether in point of fact he did entertain it. ’ ’
¶9Mr. Bishop (1 Cr. Law, Sec. 381, subd. 2) says: “Insanity, in the criminal law, is any defect, weakness or disease of the mind rendering it incapable of entertaining, or preventing its entertaining in the particular instance, the criminal intent which constitutes one of the elements in every crime. ’ ’ From this definition of insanity, criminal responsibility is to be determined solely by the capacity of the defendant to conceive and entertain the intent to commit the particular crime. If there is no intent, there is no crime. In the formation of this intent there must concur knowledge or intellectual comprehension, and the power of choice. An absence of the former necessarily implies the want of the latter, for the latter cannot, in reason, exist without it. On the other hand, the former, as a scientific fact, may exist, in some degree at least, without the latter. It therefore follows that one may have mental capacity and intelligence sufficient to distinguish between right and wrong with reference to the particular act, and to understand the consequence of its commission, and yet be so far deprived of volition and self control by the overwhelming violence of mental disease that he is not capable of voluntary action, and therefore not able to choose the right and avoid the wrong. The second instruction quoted is taken from the text at page 126, Yol. I, of Dr. Clevenger’s recent *370work on Medical Jurisprudence of Insanity, heretofore cited. At another place the same author says: “To be criminally responsible, a man must have reason enough to be able to judge of the character and consequences of the act committed, and he must not have been overcome by an irresistible impulse arising from disease. ’ ’ (Id. p. 174.) Assuming, as we do, that Mr. Bishop’s definition of insanity is correct, and sufficiently broad to cover all cases where the question of . responsibility arises, the statement by Dr. Clevenger is a direct logical result therefrom, and the doctrine that when one commits an act, otherwise criminal, under an irresistible impulse, which is the result of an overpowering mental disease, and \which he cannot control, he is not criminally responsible, must be admitted. Mr. Bishop' recognizes the doctrine, basing it upon the law of necessity, and insists that it is the duty of every judge -to recognize q.nd apply it as a part of the fundamental law of the land. (1 Bishop, Cr. Law, Sec. 383b.) Mr. Wharton (Wharton’s Cr. Law, Sec. 45), after discussing the subject, states the law thus: “The conclusion we must reach, therefore, is that an irresistible homicidal impulse in an insane person is a good defense, though such insane person was able to distinguish between right and wrong. With a sane person, however, it is not a defense, as the law makes all sane persons responsible for their impulses. ’ ’ It is, we think, the more humane doctrine, and in accord with the more advanced state of medical science and judicial reason, though courts of high standing — as in New York, California, Kansas, Georgia, North Carolina, Missouri and others- — repudiate it, and adhere to the doctrine of the right and wrong test. The following authorities are cited: Taylor’s Med. Jur. 734; Com. v. Rogers, 7 Metc. (Mass.) 500; Stevens v. State, 31 Ind. 485; Walker v. State, 102 Ind. 502, 1 N. E. 856; Conway v. State, 118 Ind. 482, 21 N. E. 285; Parsons v. State, 81 Ala. 577, 2 South. 854; State v. Windsor, 5 Har. (Del.) 512; Ortwein v. Com. 76 Pa. St. 414; Taylor v. Com., 109 Pa. St. 262; Com. v. Mosler, 4 Pa. St. 264; Graham v. Com., 16 B. Mon. 587; Blackburn v. State, 23 Ohio St. 146; State v. Pike, 49 *371N. H. 399; State v. Jones, 50 N. H. 369; State v. Johnson, 40 Conn. 136; Anderson v. State, 43 Conn. 514; Dejarnette v. Com., 75 Va. 867; State v. Felter, 25 Iowa, 67; State v. Mewherter, 46 Iowa 88; Dacey v. People, 116 Ill. 555, 6 N. E. 165; Hoehheimer Law of Crimes, See. 20.
¶10But, while we believe this to be the better rule, we agree with Mr. Bishop where he further says, in speaking of the right and wrong test: “In a ease wherein beyond controversy the defect extends only to the intellectual powers, and there is no pretense that the party cannot control his own actions, — no proof tending to show any insanity except the partial, which veils simply the understanding and not the whole man, — this right and wrong test, thus seen to be the more common form of putting the question to the jury, is correct in legal theory, and practically not misleading. For it should be borne in mind that in all issues the charge to the jury should disclose the law applicable to whatever facts the evidence tends to establish, not to any which it does not.5 ’ (1 Bishop Cr. Law, Sec. 386, Subd. 2.)
¶11Returning now to the test laid down in the instructions quoted, we see that they distinctly recognize the doctrine of irresistible impulse as the result of disease. In our opinion, they are well suited to the facts of this case. There was no proof tending to show in the defendant, at the time of the shooting, the existence of an irresistible impulse, except in so far as it might be inferred from the statement of the defendant himself, who testified in his own behalf, and stated that, as he left the court house, he was attacked by a “dizzy spell,” and had no recollection of what occurred thereafter until the following morning. Even this would seem to rebut the idea of any such condition, and tend rather to show that the shooting, if the result of any phase of insanity, was the act of unconscious madness or delirium; for, logically, the expression “irresistible impulse” implies knowledge of right and wrong in some degree, but, coupled with it, the absence of power, resulting from a disordered mind, to successfully resist the impulse to do the criminal act. The court could *372not instruct the jury on every phase or manifestation of insanity. The law was declared generally upon this, subject with such suggestions as were suitable to the facts of the case; and it was left to the jury, as was proper, to find from the proof upon the issue of insanity. (Stuart v. State, 1 Baxt. (Tenn.) 178.) 'The court was also careful to draw the'distinction between the impulse of anger or passion which does not relieve from responsibility and the phase of insanity which we are here considering. This should be done in all cases of this character, so that the wicked impulses of the evil passions, which every man is, under the law, bound to keep in restraint, may not be confounded with that phase of mental disease which the law, out of tenderness for human life and liberty, deems a sufficient excuse for crime. (State v. Brooks, 23 Mont. 146, 57 Pac. 1038.)
¶12
“No. 42. You are instructed that the law presumes every person to be sane and responsible for his acts until the contrary be shown by -the evidence, and, when insanity is set up as a defense to an alleged criminal act, the burden of proof is upon the defendant to show by a preponderance of the evidence that he was affected by insanity, as explained in these instructions, at the time of the act, to such an extent that he did not know that it was wrong to commit such criminal act, and that he was not mentally capable of choosing either to do or not to do the act or acts constituting such crime, and of governing his conduct in accordance with such choice; but if, upon all the evidence in the case, the jury entertain a reasonable doubt as to the sanity of the defendant at the time of the commission of the act complained of, they must acquit him. ’ ’
¶13This instruction was followed by another paragraph correctly defining “preponderance of evidence” as applicable to civil cases, thus emphasizing the necessity for the defendant to sustain his defense by a preponderance of the evidence. We think this was prejudicial error. The instruction is inconsistent with itself, in that, after telling the jury that the *373burden is upon the defendant to establish insanity by a preponderance of the evidence, it again tells them to acquit him if they have a reasonable doubt upon the whole case. It also conflicts in this regard with other instructions as to reasonable doubt. It is wrong in principle, because, under our view of the law, the burden of establishing this defense by a preponderance of the evidence is never cast upon the defendant.
¶14As to the inconsistency of the instruction with itself and with others upon the sub3ect of reasonable doubt, it is sufficient to say that, wherever instructions are upon a material point, the one correct and the other incorrect, this court will not presume that the jury followed the correct instruction, but will reverse the judgment, and order a new trial. (State v. Rolla, 21 Mont. 582, 55 Pac. 523.)
¶15The first part of the paragraph- states a wrong principle: The doctrine of reasonable doubt must be applied to every fact material and necessary to establish the defendant’s guilt. It should be applied in all criminal cases,- — to those in which insanity is the defense as well as others. Yet under this statement the defendant could be acquitted upon a reasonable doubt which might arise only after he. had produced proof sufficient to. incline the balance in his favor on the issue of insanity.1 If there should be an equipóse, he could not. be acquitted, because the proof would not have weight to the degree at which the reasonable doubt could come to his aid. Under the same condition of proof in a civil case, where the burden was upon the plaintiff to make out his case, the defendant would be entitled to a judgment in either instance. Nor is the fallacy of the position obviated by the statement that the legal presumption of sanity must be rebutted by the defendant. This presumption is rebutted and disappears whenever sufficient proof is introduced to raise a reasonable doubt as to defendant’s sanity. And it makes no difference from which side it comes. From the moment it appears the burden is at once upon the state to establish .the responsibility of, the defendant, and that beyond a resonable doubt; for legal responsibility is a necessary ingredient of guilt, and a reason*374able doubt of the sanity of the defendant is, in a legal sense, a reasonable doubt of his guilt. If at the end of the state’s case no proof has been introduced upon this subject, — and the state is not bound to introduce any in the first place, — the legal presumption of sanity remains unimpaired, and prevails. The burden then devolves upon the defendant- to produce some proof tending to show that he was not responsible at the time the criminal act was committed, but he is not bound to produce any more than is sufficient to raise a reasonable doubt. If this is not then successfully rebutted by the state, he is entitled to an acquittal. It is only in this sense that the burden ever rests upon him under Penal Code (Sec. 2081), as was clearly explained by Mr. Justice Hunt in State v. Brooks, supra. In Davis v. U. S., 160 U. S. 467, 16 Sup. Ct. 353, 40 L. Ed. 499, Mr. Justice Harlan, in an able and lucid opinion, discusses the question under consideration, collating many of the adjudicated cases. This case is cited with approval in State v. Brooks, supra,and the final summing up of Justice Harlan is there quoted. The question under consideration here was not directly involved in that case, but the conclusion reached in Davis v. United States is so well supported by yea-son and authority that we here approve it again, and adopt it. In Territory v. Edmonson, 4 Mont. 146, 1 Pac. 738, and Territory v. Tunnell, 4 Mont. 148, 1 Pac. 742, a different construction was given a provision substantially the same as section 2081, supra, (section 40, Fourth Division, Rev. Stat. 1879.) We are satisfied that the interpretation there given to this provision was founded on an erroneous view of the law, and to the extent to which these cases conflict with our present conclusion as stated in State v. Brooks, supra,and this case, they are overruled.
¶16
¶17Let the judgment and order refusing a new trial be reversed, and the cause remanded, with directions to grant a new trial.
¶18Reversed and remanded.