74 



LECTURES ON IMMUNITY 



figures regarding the coagulation of milk at different 

 dilutions or with the addition of different quantities of 

 calcium chloride. The most interpretable results were 

 yielded by the additions of calcium chloride. The milk 

 itself contained 0.6 per cent if diluted in the proportion 

 10 : 8, which was employed in these experiments. Eight 

 c.c. of milk were mixed with i, 0.5, or 0.25 c.c. of a rennet 

 solution, R, and with different amounts of a solution of 

 calcium chloride and water until the total volume was 

 10 c.c. The authors give the following values: 



As will be seen from these figures, the product 

 (/ + o.6y is nearly constant, if p does not exceed 2%. 

 This relation is quite like that representing the connection 

 between the quantity of rennet and time of coagulation. 

 If the quantity of rennet is called R, the complete equa- 

 tion for the time of action is R(p 4- o.6)/ = const. The 

 value 0.6 which must be added to p to obtain a constant 

 value may be regarded as the quantity of calcium ions 



