NEUTRALISATION OF H^MOLYSINS 



where a is the quantity of ammonia present from the be- 

 ginning, before boracic acid was added, q the quantity of 

 free un-neutralised ammonia, n is the added quantity 

 of this acid, consequently (a <f) the quantity of salt 

 formed, and \n (a q)\ the quantity of free boracic 

 acid. The quantities should be expressed in equivalents, 

 and one molecule of NH 3 is found to be equivalent to one 



0.5 i. 1.5 2.X 



FIG. 3. 



molecule of H 3 O 3 B. The constant K has a value depend- 

 ent on the temperature. The last equation is a form of 

 the equation expressing the law of Guldberg and Waage. 

 A special theoretical investigation showed that it might be 

 employed in this case. 



Now the toxicity is proportional to the concentration of 

 free ammonia, though in this case a correction must be in- 

 troduced for the lowering action of the ammonium salt, as 

 indicated by experiments on this action. Therefore, if we 



