evident that we can assign no period, with any thing like accuracy, at which the corpse shall rise through decomposition.  Under certain conditions this result would be brought about within an hour; under others, it might not take place at all.  There are chemical infusions by which the animal frame can be preserved foreverfrom corruption; the Bi-chloride of Mercury is one.  But, apart from decomposition, there may be, and very usually is, a generation of gas within the stomach, from the acetous fermentation of vegetable matter (or within other cavities from other causes) sufficient to induce a distension which will bring the body to the surface.  The effect produced by the firing of a cannon is that of simple vibration.  This may either loosen the corpse from the soft mud or ooze in which it is imbedded, thus permitting it to rise when other agencies have already prepared it for so doing; or it may overcome the tenacity of some putrescent portions of the cellular tissue; allowing the cavities to distend under the influence of the gas.

“Having thus before us the whole philosophy of this subject, we can easily test by it the assertions of L’Etoile.  ‘All experience shows,’ says this paper, ’that drowned bodies, or bodies thrown into the water immediately after death by violence, require from six to ten days for sufficient decomposition to take place to bring them to the top of the water.  Even when a cannon is fired over a corpse, and it rises before at least five or six days’ immersion, it sinks again if let alone.’

“The whole of this paragraph must now appear a tissue of inconsequence and incoherence.  All experience does not show that ‘drowned bodies’ require from six to ten days for sufficient decomposition to take place to bring them to the surface.  Both science and experience show that the period of their rising is, and necessarily must be, indeterminate.  If, moreover, a body has risen to the surface through firing of cannon, it will not ’sink again if let alone,’ until decomposition has so far progressed as to permit the escape of the generated gas.  But I wish to call your attention to the distinction which is made between ‘drowned bodies,’ and ’bodies thrown into the water immediately after death by violence.’  Although the writer admits the distinction, he yet includes them all in the same category.  I have shown how it is that the body of a drowning man becomes specifically heavier than its bulk of water, and that he would not sink at all, except for the struggles by which he elevates his arms above the surface, and his gasps for breath while beneath the surface — gasps which supply by water the place of the original air in the lungs.  But these struggles and these gasps would not occur in the body ’thrown into the water immediately after death by violence.’  Thus, in the latter instance, the body, as a general rule, would not sink at all — a fact of which L’Etoile is evidently ignorant.  When decomposition had proceeded to a very great extent — when the flesh had in a great measure left the bones — then, indeed, but not till then, should we lose sight of the corpse.