delivered the opinion of the court.

The complaint in this case, a case of assault and battery with aggravated circumstances, charged substantially that the defendant, Andrés Galarza, illegally and voluntarily assaulted and battered the boy Ramón Alonzo, kicking him on the leg and thereby breaking it. The proof shows that in the yard of a school at Bayamón some one of a group of schoolboys threw a sucked orange at the defendant, another schoolboy who had recently entered the school. Angered by this act, the defendant went up to the group and struck one of them a blow with his fist, whereby the boy assaulted apparently fell against a palm, slipped to the ground and broke his- leg.

The principal error assigned in this appeal is the variance between the complaint and the proof. Both the aggressor and the boy assaulted were schoolboys and the specific mat*336ter of aggravation is that a serious bodily injury was inflicted upon the prosecuting witness.

It is a general.principle of criminal law that when a homicide or an assault is charged with a particular instrument the attack must be proved as laid. 21 Cyc. 873; 2 R. C. L. Title Assault and Battery, par. 48; 10 Encyclopaedia of Pleading and Practice, 128; Commonwealth v. McAfee, 108 Mass. 458; 11 A. R. 383; Jones v. State, 62 S. W. 758; Wilson v. State, 60 So. 983; State of Louisiana v. Braxton, Jr., 47 La. Ann. 158. If, however, a blow with a particular instrument is described, like a- gun or a knife, if a gun is alleged a revolver may be shown, and if a knife is alleged any other similar cutting instrument may be proved. Elliot v. State, 111 Pac. 820; Shelton v. State, 100 S. W. Rep. 955; Gipe v. The State, 165 Ind. 433, and cases supra. Or, as said by -the Indiana Court in Gipe v. The State, supra, the proof must agree with the allegation in its substance and generic character.

It has uniformly been held to be a variance to charge an injury from a blow and then prove an injury which follows from a fall as the result of a blow. Helmerking v. Commonwealth, 37 S. W. Rep. 264; Koser v. People, 224 Ill., 206; State v. Reed, 55 S. W. Rep. 278; State v. Jenkins, 94 A. D. 135; State v. Lowber, 1 Houston Crim. Rep. 340. Perhaps in some cases the allegation of a kick might be supported by proof of a blow with the fist when the injury is a direct result of the kick or the blow, but under the authorities this could not be the case where the injury is caused, not directly by the blow, but by a fall on the ground.

The defendant is entitled to know the nature of the attack with which he is charged, and this is especially true in an assault case when the prosecution is attempting to prove a matter of. aggravation. There was clearly a variance between the complaint and the proof in the case at bar. This being so, it is unnecessary to consider the other questions *337raised in this appeal. The judgment must be reversed and the prisoner discharged.

Reversed.