38 



Hydration and Growth. 



and hydrochloric acid taken from a solution by various materials comes 

 within the range of this chapter. In these tests 3 to 6 grams of the 

 colloid or of the plant material were placed in a dish containing about 

 100 c. c. of the acid solution at 21 C. The results are given in table 18. 



TABLE 18. Water absorbed from hydrochloric acid per gram dry substance. 



The amount of acid absorbed was greatest in all cases from the high- 

 est concentrations used. The amount of hydration which accom- 

 panied the incorporation of the acids in the colloids is given in 

 table 19. 



TABLE 19. Absorption of hydrochloric acid and water from solution, per gram dry 



substance. 



