412 Nature of Substance in Serum which influences Phagocytosis, 



4. In the case of certain normal sera (guinea-pig and rabbit) previously 

 investigated for amboceptor and complement in relation to the extra- 

 corpuscular bacteriolysis of the typhoid bacillus (Wechsberg), an exact 

 parallelism can be demonstrated to exist between that function and opsonisa- 

 tion. The normal amboceptor can be complemented by fresh serum in 

 regard to both functions. 



5. An " anti-complement " serum, when mixed with a fresh normal serum 

 alone or in a mixture containing heated immune serum, throws out of action 

 the thermolabile substance, whereas it does not appear to influence the 

 thermostable substance. 



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Bestimmung der relativen Pepsinmenge," vol. 9, p. 577. 

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