4^o. Added an equal weight of alcohol and melted; pressed after two days. The liquid by this time, was light yellowish; the fatty crystals in white flakes or scales; the smaller ones transparent under the microscope, and polarizable. A portion of the fat was melted, and observed cooling under the microscope with polarized light; as the solidification approached, a beautiful play of prismatic colours took place, and the drop shot into crystal interlaced lamellæ. A drop melted with alcohol, and let cool, gave the peculiar dendritic curved appearance of margaric acid. 5^o. The fat by this time weighed 300 grammes; it was melted with an equal weight of alcohol, and pressed the following day. Residue, 253 grammes. 6^o. This was melted with 250 alcohol; the liquid from the press was very little less coloured than the last; the residue weighed 227 grammes, and was brilliant white, with a tinge of yellow; the fracture showed large crystals, and could not be distinguished from the product of the stearic candle factories. When melted, it cooled with raised, uneven surface, and was completely soluble in ether. When the ethereal solution was suffered to separate spontaneously, the first fat which made its appearance melted at 60°, solidified at 55°, and the fat extracted from the rest of the ether gave exactly the same points. The following are the melting points yielded by the fatty residues of the foregoing alcoholic crystallizations: Fat melts solidifies 2^o 58° 53° 3^o 58° 53° a 52° 4^o 58° 53° a 52° 5^o 58° a 58.5° 53° 6^o 60° 55° a 54° The examination of the liquids separated from the above crystallizations, was now taken up. Their colour was from a very deep reddish brown (No. 1^o) down to light yellow, and nearly colourless (No. 6^o.) In 1^o, 2^o, and 5^o, crystals had deposited by standing, and as 2^o was not corked like the rest, the deposit here was abundant; it was re-melted with addition of as much alcohol as had evaporated, and was suffered to stand for several days longer, when a drusy crystalline deposit made its appearance. The following are the melting points for these two precipitates: Precipitate in 1^o melts 62°-63° solidifies 44°5-40° Precipitate in 5^o melts 51°-56° solidifies 44°5-43° The fat deposited in 2^o melted at 58°, and solidified at 52°, and the fat separated from the _liquid_ of this bottle, melted at 59°5, solidified at 53°, but continued translucent down to 33°. After the above melting points, 1^o and 5^o were observed, the same fat was raised slowly to the melting points, and then kept for a considerable time in the thermostat, at 100°, the points were again determined, and found to be the same. The liquids separated from the fats 1^o-6^o, gave the following results: