66 IMMUNE SERA. 



called precipitins* This power of the organism to 

 react to the injection of foreign dissolved albumin- 

 ous substances has been found to be very extensive. 

 Lactoserum Other Specific Precipitins. Bordet, 

 by injecting cows' milk into rabbits, was able to 

 produce a serum which precipitates the casein of 

 cows' milk. He called this lactoserum. Ehrlich, 

 Morgenroth, the author, Schutze, Myers, and Uhlen- 

 huth showed that by treating a rabbit with chicken 

 albumin a precipitin is formed which precipi- 

 tates chicken albumin. Myers, by treating animals 

 with Witte's pepton and globulin, produced a serum 

 that contained specific anti-peptons and anti- 

 globulins. Pick and Spiro, by using albumose, 

 produced anti-albumoses. Lechainche and Vallee, 

 Stern, Mertens, and Zulzer treated animals with 

 human albuminous urine and produced a serum 

 which contained a precipitin specific for this sub- 

 stance. Schutze, by treating rabbits with a vege- 

 table albumin, as well as with human myoalbumin, 

 produced a precipitin specific for these albumins. 

 This does not exhaust the recital of the work done 

 in this field, and there is a host of other albuminous 

 bodies which, when injected into an animal, are 

 able to excite the production of specific precipitins. 

 The production of precipitins for the albuminous 



* It will be recalled that, besides the production of pre- 

 cipitins, the above procedure causes the formation of other 

 anti-bodies such as anti-complements, anti-agglutinins, 

 etc. 



