PASSAGE INTO SOLUTION 



285 



TABLE V 



* That is to say, at some undetermined time previous to this all of the casein introduced into 

 the solvent had been dissolved. 



The relation between the amount of casein dissolved in a given 

 time and the mass of casein initially added to the solvent is 

 shown in Table V and graphically in accompanying figure. The 

 temperature of the mixtures was, in all of these experiments, 



20 degrees. It will be seen that the rate of solution" increases, 

 at first somewhat rapidly with the mass of casein added to the 

 solvent, later more slowly. 



Reverting to equation (iv), the relation x = Kt^ is, it is of 

 interest to observe, the same as that found by Cameron and 

 Bell (14) (15) and later confirmed by Ostwald from the investi- 

 gations of Goppelsroeder (66), to subsist between the amount 

 of fluid absorbed by a column of sand or a strip of filter-paper 

 and the time during which the fluid has remained in contact 

 with a portion of its surface.* 



The values of the constants are also of the same order of mag- 

 nitude as those found in these investigations. It is possible, 

 therefore, that the rate of solution of the casein is primarily 



* According to Cameron and Bell (14), this formula can be derived from 

 the formula of Poiseuille for the flow of liquids through capillary spaces. 



