Hydration and Growth of Colloids and Cell-masses. 



113 



ing r61e. A much more pronounced effect, however, was secured at the 

 temperature of 31° C. (fig. 20). 



Plates of agar 90 and oat protein 10 parts which were 0.16 mm. in 

 thickness were swelled at a temperature of 31° C. at intervals of 2 

 hours or more, with the results given in table 88. 



The acceleration, as expressed by the total during the first 4 hours, 

 was as 13 to 22 in the rise from 23° C. to 31° C, as 19 to 28 when the 

 first 8 hours is considered, and as 25 to 38 when the entire swelling is 

 taken into account. Raising the temperature to 39° C. gave swellings 

 as shown in table 89. 



Table 89. 



Table 90. 



Agar 90, oat protein 10. 



4 hours.. 



8 hours.. 



10 hours.. 



Swellings, 

 p. cl. 

 2,555 

 2,833 

 2,888 



The acceleration accompanying this rise of 8° C. was followed by 

 an increase which was as 22 to 25 during the first 4 hours, 28 to 29 

 during the second 8 hours, and the hydration for the entire period was 

 actually less at this higher temperature. That the hydration passed 

 beyond the limits of acceleration and of total water-holding capacity 

 in this temperature region was denoted by the fact that swellings at 

 46° to 47° C. were as given in table 90. 



Table 91. 



It is to be seen that while the final capacity for swelling at 15° C. 

 had not been reached in 20 to 22 hours, it was practically complete 

 at 39° C. in 12 hours, as the continuance of the measurement would 



