LECTURES ON IMMUNITY 



carry out experiments on the toxicity of ammonia with the 

 addition of different quantities of boracic acid, this toxicity 

 may be calculated according to the equation cited. On 

 the other hand, this toxicity may be determined directly 

 from the haemolytic power. In this case we suppose that 

 the quantity of ammonia absorbed by the erythrocytes 

 may be neglected (cf. p. no). The comparison between 

 the results of observation and calculation (K=i.O2) is 

 given in the following table : l 



TOXICITY (^) OF o.i N. NH 3 (i EQUIVALENT) WITH n EQUIVALENTS 

 OF BORACIC ACID 



The agreement between the observed and calculated values 

 of q is quite within the limits of the errors of observation. 

 Under A^ obs> is tabulated the quantity of ammonia which 

 is neutralised with regard to its haemolytic power by the ad- 

 dition of the sixth part of one equivalent of boracic acid. 

 The two first additions lower the toxicity by nearly the same 

 amount (16.7 per cent) as a strong acid. The portions 

 between one and two thirds and between two and three 

 thirds have a noticeably lower influence (about and f re- 



1 According to a recent investigation by H. Lunden on the hydrolysis of 

 ammonium -borate the constant K is 1.02 in complete agreement with the 

 value given above as results of experiments on hydrolysis. 



