CHAP. I.] FERMENT PRODUCTS ULTIMATELY ARREST PROCESS. 45 



action act pre- medium in the" act of fermentation, gradually slow, and 

 u iti ma t e ly arrest the specific process, which may be re- 

 stored to its original intensity more or less completely 

 by dilution, or still better by separating the soluble 

 ferment products by diffusion. In order to accomplish 

 the latter object, the process of digestion has been carried out in 

 specially constructed dialysers, such as those which we owe to 

 Kronecker (Fig. 2), and that of Sheridan Lea, shewn in the accom- 

 panying figures (Fig. 3). In Lea's apparatus the digestive process is 



iciaiiy on 



and tend to 

 arrest it. 



Fm. 2. KRONECKER'S APPARATUS FOR THE SEPARATION BY DIALYSIS OF THE PRODUCTS 



OF DIGESTION. 



