Ill 



necessary for the production of the given haemolysis, 

 calculated according to the above reasons, c calc. is 

 calculated from the above equilibrium-formula, in which 

 the constant K is put : 1.02. Finally the table under 

 the headings Gobs, and Gcalc. contains two columns, 

 indicating the observed and the calculated toxicity of 

 the mixtures in question in the same manner as in the 

 case of tetanolysin. 



G x 



e 2 



0,5 



1 



x G 



2 6 



2 



0,-. 



Fig. 5. 



Neutralisation of ammonia bv boracic acid. 



+ observed values. ' toxic quantity 

 X toxicity 



The concordance between the observed and the cal- 

 culated values is quite satisfactory and the difference 

 not greater, than may be explained by errors of expe- 

 riment. The experiments 2 4 have throughout given 

 lower values of ccalc. than of cobs. In this case the 

 dissociated parts of ammonia and boracic acid play per- 

 haps a perceptible role, and it is worthy of notice, that 

 a correction in this direction would increase the agree- 

 ement, but we want observations at a temperature of 

 37 C., by means of which this correction could be made. 



66 



