SOLANACER. : ol 
nown that a 5 per cent. solution of sodic chloride is the most 
ficient in the extraction of the active principle from the 
There is no doubt that the substance which possesses the 
lating power is a ferment closely resembling animal 
ennet. 
ri—A portion of the 5 per cent. sodie chloride extract loses 
8 activity if boiled for a minute or two. 
4 II.—The active principle is soluble in glycerine, and can be 
racted from the seeds by this means ; the extract possesses 
mg coagulating powers even in small amounts. : 
—Alcohol precipitates the ferment body from its solu- 
; and the precipitate, after washing with alcohol, may 
dissolved again without having lost its coagulating 
.—The coagulation is not due to the formation of acid by 
erment. If some of the active extract be made neutral or 
line, and added to neutral milk, a normal clot is formed, and 
reaction of the clot remains neutral or faintly alkaline. 
T The clot formed by the action of the ferment is a true 
resembling i in appearance and properties that formed une. 
rennet, and it is not a mere precipitate. 
question of preparing an extract which should be 
of being kept for a considerable time is perhaps of im- 
- Ordinary commercial rennet usually contains a large 
H Bodie chloride and some alcohol. One specimen I 
ined 19 per cent. of common salt, and 4 per cent. 
have, therefore, added to the 5 per cent. chloride _ 
ed above enough salt’ to raisc the percentage 
and also alcohol up to 4 per cent. The 
ct is not appreciably altered by this, and 
