AS RESERFE-MATERIAL IN PLANTS. 
33 
some reactions, of which the living protoplasm is not capable on 
account of changing too quickly.—As to the great difference 
between the active and the passive albumen, convincing evidence 
has been furnished, and we recall here the more striking points 
of this chemical difference : 
1. The power of combining with water is greater with the 
active than with the passive albumen ; 
2. Coffein and antipyrin exert action upon the active, not 
upon the passive albumen ; 
3. Alcohol of 10-20 per cent, vapors of ether, very dilute 
acetic acid, change the active, but not the passive albumen ; 
4. Active albumen absorbs ammonia and turns thereby in¬ 
soluble, while passive albumen remains indifferent. 
5. Active albumen reduces highly diluted alkaline silver 
solutions, passive albumen does not. 
