242 CHEMlsriiV OF the IMMUMTY NEACTIOXfi 



of specific cytotoxins a closed chapter; improved methods for sepa- 

 rating our antigens may yet enable us to secure antibodies specific for 

 a single tissue or organ. (See Specificity of Antigens, Chap, vii.) 

 However, by the useful method of studying the effect of cytotoxic 

 serum on the growth of tissue cultures in vitro, Lambert ^- found no 

 evidence whatever of specificity, although there is a non-specific inhi- 

 bition of growth by the immune sera. 



32 Jour. Exp. Med., 1914 (19), 277; also Walton, ibid., 1915 (22), 194. 



