Chemistry and Physics. 103 
the same time much moved. The gastric juice thus obtained was almost 
perfectly clear, scarcely opalescent. The stomach of a dog of the size 
a poodle contained from fifieen to forty grms. of a liquid, which flow- 
quantitatively. Treated in this manner, a gastric juice which was but 
slightly opalescent for instance, yielded 1-808 per cent. of solid residue, 
125 per cent. muriatic acid, and 98-067 per cent. of water. This 
muriatic acid is formed by the decomposing action of the lactie acid at 
a certain degree of concentration, even in the cold, upon many chlorids, 
especially those of calcium and magnesium, but not the chlorids of po- 
tassium and sodium. ‘To prove the presence of the lactic acid itself 
with certainty, the gastric juice was concentrated in vacuo to one-twelfih 
its volume, the residue mixed with alcohol of 0°85 spec. grav., the spir- 
ituous solutions from several stomachs evaporated to the consistence of 
a syrup, and the residue exhausted with absolute alcohol. The residue 
water to remove the fat, and filtered. On further concentration, more 
saturated with lime, partly with magnesia, and the salts formed were 
purified by several recrystallizations from alcohol and water. The 
Magnesian salt, dried at 266° F., and then incinerated, gave 16°666 
per cent. of magnesia, 61°906 per cent. lactic acid, and 21423 per 
cent. water; the formula MgO, La+3HO requires 16-085 per cent. 
magnesia, 62-936 per cent. lactic acid, and 20-979 per cent. water. In 
alcohol, or the formation of yellowish-brown films on evaporation. 
The gastric fluid thus obtained yielded no muriatic acid under the air- 
pump. From this fluid a magnesian salt was also obtained. I. gave 
16°666 per cent. of magnesia, 62'122 La, and 21-212 HO; IL, which 
was obtained by exhausting the contents of the stomach with water, 
gave 15-966 per cent. Mg0, 62-026 La, and 21-008 per cent. of HO. 
The equivalent of titanium has been determined from the bichlorid of 
titanium by M. Isidore Pierre, Professor at Bordeaux. He obtained, in 
4 ree . . 
311-84, 309-88; in a second series, 313-41, 311-30, and in a third 
311-58, 309-41. Operating with the greatest care some small pro- 
