Legal insanity under Section 84 IPC requires incapacity to know the act's nature or wrongfulness; conviction upheld.

Section 84 IPC excludes criminal liability only where, at the time of the act, the accused was incapable of knowing the nature of the act or that it was wrong or contrary to law. The defence concerns legal insanity, not mere medical insanity, and the burden under Section 105 of the Evidence Act rests on the accused, though it is lighter than the prosecution's burden. Conduct before, at, and after the may be relevant, but abnormal behaviour alone is insufficient. On the findings recorded, the material did not show loss of cognitive capacity at the time of the offence, so the protection of Section 84 was denied and the conviction stood.

---

---

Issues: Whether the appellant was entitled to the benefit of Section 84 of the Indian Penal Code, 1860 on the ground of unsoundness of mind.

Analysis: Section 84 embodies the rule that criminal liability is excluded only where, at the time of the act, the accused was incapable of knowing the nature of the act or that it was wrong or contrary to law. The relevant inquiry is legal insanity, not merely medical insanity. The burden to establish this defence lies on the accused under Section 105 of the Indian Evidence Act, 1872, though it is not as onerous as the prosecution's burden. Conduct before, at, and immediately after the occurrence may be relevant, but abnormal, odd, or unusual behaviour by itself does not establish the defence. On the facts found by the courts below, the material did not show that the accused lacked the requisite cognitive capacity at the time of the offence.

Conclusion: The appellant was not entitled to the protection of Section 84 of the Indian Penal Code, 1860, and the conviction was upheld.

---