216 STUDIES IN IMMUNITY. 



CONCLUSIONS. 



Under this heading we shall note only the facts subjected to 

 experimental proof in the first two sections of this article : 



1. Corpuscles sensitized by a given sensitizer are destructible 

 by the different alexins (normal sera) of many if not of all animal 

 species. 



2. In a given serum the bacteriolytic is identical with the hemo- 

 lytic alexin. 



3. The fixing properties of corpuscles for the active substances 

 of hemolytic sera lie in their stromata. This fixation is similar to 

 a process of dyeing. 



4. An antitoxin to a hemolytic serum may be produced. This 

 antitoxin has both an antisensitizing and an anti-alexic property. 



5. Owing to its anti-alexic property the antitoxin is both anti- 

 hemolytic and antibactericidal. 



6. The anti-alexin would seem to neutralize the alexin by acting 

 directly upon it. 



7. The anti-alexin in question is specific, although not absolutely 

 so. It neutralizes guinea-pig alexin, but has no effect on alexins 

 from most other animals. 



