_B._ The bullock’s heart had been so divided, that each half contained an auricle and ventricle, which were placed in the bottles, (_a_) with water, (_b_) with carbonic acid water. The appearance of the contents of these bottles at present is similar, though (_a_) seems to be more disintegrated. In both of these, the cavities and valves of the heart maintain, in a measure, their form, and the chordæ tendineæ are in perfect preservation: the serous covering of the heart is consistent; and in (_b_) it is, in parts, quite black from sulphuret of iron. The fluid in both bottles reacts strongly alkaline; when the mass of the heart is cut open, the muscular fibre appears of a dirty, yellowish-red colour, and when examined under the microscope, shows the fibre, but without any of the cross-markings in (_b_). In (_a_), which was more disintegrated, by the addition of water and a power of 700 diameters, the fibre could be seen broken in small portions, and giving evident traces of both longitudinal and cross-breaking up of the sarcous substance. The fibres of (_a_), treated with hot and cold alcohol evinced no change; with hot acetic acid they shrunk in dimensions. The weight of (_a_) dripping with liquid was 330 grammes, that of (_b_) 275 grammes. _C._ The Eggs.--The water was strongly alkaline; the shelled eggs were seen in broken, yellowish-white lumps, and a thick deposit at the bottom of the bottle, gave no evidence of crystallization under the microscope with polarized light. The liquid from the eggs and from the two heart experiments emitted rather a disagreeable odour, which was mingled with an aldehyde smell. As decomposition had not advanced to its full extent in these bottles, I preferred setting them aside for a future research, when both the solid and the liquid contents will be examined. Braconnot’s[8] analysis of bullock’s heart is as follows:— Water, 77·03 Fibrine, cellular tissue, nerves, vessels, 17·18 Albumen and colouring matter of the blood, 2·70 Alcoholic extract and salts, 1·94 Aqueous extract and salts, 1·15 —————— 100·00 ARTIFICIAL FORMATION OF ADIPOCIRE.