ON RUNNET AND CHYMOSINE. 
1.97 
on the sides of the flask small crystalline grains, which are 
composed of phosphate of lime, and phosphate of ammonia 
and magnesia ; the filtered liquor was acidulated with tartaric 
acid, introduced into a retort, and distilled so as to obtain 500 
grs. of product. These 500 grs. were saturated with ammo- 
nia, and 250 grs. were distilled over; the residue was neutral; 
tartaric acid was added, and the distillation continued. These 
two products were saturated with potassa,and evaporated; they 
contained, the first, capric acid, and the second caproic and bu- 
tyric acids. In another experiment, the first distillation was 
continued to obtain a greater quantity of product, and con- 
tained capric and caproic acids, while the second contained 
butyric acid. 
Runnet contains : 
Hydrochloric acid in large amount. 
Butyric " 
Caproic " 
Capric " 
Lactic " 
Hydrochlorate of ammonia. 
Chloride of Soda, independent of any added, but the addi- 
tion of this salt augments the secretion of the hydrochlo- 
rate of ammonia. 
Magnesia, not as an ammoniaco-magnesian-phosphate. 
Soda, probably with the magnesia, as a lactate. 
Traces of a sulphate. 
Phosphate of lime. 
And a peculiar matter, which I name chymosine, from 
2i>iuo$, chyme; ^upxjts, chymification. 
To obtain impure chymosine, a small excess of ammonia is 
added to runnet. The precipitate is filtered, washed and dried. 
Dry chymosine resembles gum, or emulsine. Hydrated or 
dry, it is insoluble in water ; its insolubility is so "great, that 
after being immersed several hours, it may be powdered un- 
der this liquid ; but it is soluble in acidulated water. This 
solution exercises the power of curdling milk, but is not as 
