136 



CHEMICAL EQUILIBRIA 



(4oA-P)(i2o-P)_ K _ 



V V 



250. 



In this case when a precipitate is formed the pro- 

 duct of the concentrations ^ ' of the sheep 



v 



, (I20-P) . 



serum and - L of the rabbit s serum, in which 



v 



v is the total volume of the mixture, should be a 

 constant K, which is found equal to 250. The 

 formula indicates that in i cc. of the diluted sheep 

 serum there is enough material to give 40 units of 

 precipitate and that 0-4 cc. of the rabbit's serum is 

 enough to give 120 units of precipitate. On the 

 formation of precipitate equivalent quantities of 

 sheep serum and of its specific precipitin disappear 

 from the solution. 



The results are embodied in the following table : 



B denotes i cc. of physiological, i.e. 0-9 per cent salt solution. By the 

 addition of this the dilution of the sheep serum was still more increased. 



The agreement between the observed and the 



