SINGLE NATURE OF HEMOLYTIC IMMUNE BODIES. 345 



(Sachs (Central, fur Bakt., etc., Abt. I, Orig. Bd. XXXIX, 1905) 

 has questioned the experimental accuracy of the part of this article 

 bearing on complementoids. In a reply Gay (Central, fur Bakt., 

 XL, 1906, 695) has repeated the experiments and proved that dog 

 serum heated to 51 C is not only slightly hemolytic for guinea-pig 

 corpuscles, but will hemolyze more markedly either rabbit or guinea- 

 pig corpuscles that have been treated with a heated immune serum. 

 The conclusion, then, is that in classical examples of "complement- 

 oids" we have to deal with a " complement" the toxicity of which 

 has simply been attenuated, and that no satisfactory experimental 

 proof of the existence of "complementoids" exists. F. P. G.) 



