192 



Tests ivlth Precipitins 



Beactions 



28 "/o 



92 7o 



Other 

 mammals 



than 



Ungulata 



5 7o 



t One from China (393), the other (342) from London Zoo. 



e. Equidae. 

 (9) Tests with Anti-Horse Serum. 



Anti-horse scrum was first obtained by Tchistovitch (v. 1899) by 

 treating rabbits with horse serum, injections of 3 c.c. being made 

 5 — 6 times, at intervals. We may conclude that his antiserum was 

 very weak indeed, for the reason that he states it produced a reaction 

 with the serum of the horse, but not with that of the donkey. Tests 

 upon normal rabbit scrum also proved negative. Nolf (v, 1900), and 



