COLLECTED STUDIES IN IMMUNITY. 



a goat with ox blood. Naturally the serum of the goat so treated 

 dissolves ox blood-cells. Besides this, however, it manifests the 

 ability to dissolve the blood-cells of a few other goats, and therefore 

 contains true isolysins such as we have previously produced by 

 treating goats with goat blood. Thus 0.025 cc. of the serum of 



TABLE III. 



BINDING OF THE IMMUNE BODY OF A RABBIT TREATED WITH Ox BLOOD, WITH 

 Ox BLOOD-CELLS, AND GOAT BLOOD-CELLS. 



one of our goats, on the addition of complement, dissolved the usual 

 amount of ox blood-cells. This serum, however, dissolved but two 

 out of five different specimens of goat blood, and the isolysin con- 

 stituent was present in only very small amounts, so that it required 

 0.75 cc. serum (thirty times the above amount) to effect complete 

 haemolysis of sensitive goat blood-cells. Hence in this case also 

 the development of all such amboceptors as could find a point of 



