powerful antidotes; all medicines taken from the class of diffusible stimuli will be useful in supporting the powers of the system against the sedative influence of the poison. Hot brandy and water, with ammonia, camphor, and other similar stimulants, are the resources to which we should fly upon such occasions. _Organic lesions discovered on Dissection._ The recorded dissections of persons, who have been poisoned by Prussic acid, are too few and vague to furnish any satisfactory generalization. In the case related by _M. Foderé_, of two servants who died after a draught of laurel-water, the dead bodies were carried to the University at Turin, and examined, when the stomach was found slightly inflamed, but the other parts were in a sound state. We feel much hesitation in giving credit to this report, the death was too immediate to allow the access of inflammation; we are rather disposed to consider the appearances of the stomach to have arisen from that species of sanguineous congestion, which we have before alluded to, as sometimes occurring in cases of sudden death. In other cases the coats of the stomach are said to have been black and relaxed; the vessels of the brain injected; the lungs have also been described as presenting unnatural congestions, and purple spots; and the smell of Prussic acid seemed as if it pervaded the whole system, and was embodied, as it were, with the very substance of the muscles. In other cases, again, not the slightest trace of any morbid appearance could be discovered. Some authors have stated that in cases of death by this poison the cornea of the eye does not collapse, but retains its fulness, and even its lustre, for a considerable period. _Chemical processes by which the presence of hydro-cyanic acid may be ascertained._