ALKALI PROTEINS WITH LAPSE OF TIME 115 



Table 64. 

 Sodium Hydroxide + 0-5 per cent. Casein at 25. 



hours reaches a fairly constant value which is independent of 

 the alkali concentration. An increase in viscosity preceding 

 the decrease, such as appears when time observations are made 

 on alkali albumins, is not noticeable in the case of casein. On the 

 other hand the rapid decrease in electrical conductivity is also 

 displayed by casein ; for example, with 0-5 per cent, caseinate 

 plus 0-025 N sodium hydroxide, it falls to half the original value 

 after forty-eight hours (see the same paper, Table 4) . 



The increase with time of the quantity of alkali which enters 

 into combination is also very clear with alkali caseinates, as 

 the following table shows. 



Table 65. 



Temperature 18 21. 0-5 per cent, casein in all cases. 



82 



