PARENTERAL DIGESTION 73 



pigs sensitized to horse serum elaborated a 

 poison when incubated with horse serum. (14) 

 The serum and organ extracts of guinea-pigs 

 sensitized to typhoid bacilli gave a poison when 

 incubated with typhoid bacilli. (15) Like re- 

 sults were obtained with the cholera bacillus. 



(16) In case of egg-white the serum ceases to be 

 active in about forty days after sensitization. 



(17) When the amount of protein incubated 

 with the serum and organ extracts was larger 

 than 1 mg. per 5 c.c. the results were less cer- 

 tain. 



If there was not more luck than science in 

 these experiments they clearly show specificity. 

 I now know that there would be a chance of get- 

 ting some positive results with a nonspecific se- 

 rum, but it seems impossible for these results 

 to have been so uniform on any other ground 

 than that of specificity. Besides, they compare 

 with the results obtained by Pf eiffer who found 

 that the sera of guinea-pigs digested, for about 

 forty days after sensitization, the protein to 

 which the animal had been sensitized. 



Abderhalden and his students in numerous 

 experiments have shown by the polariscope that 

 the blood serum of a sensitized animal has a 

 more marked digestive action on the specific 

 anaphylactogen than has the serum of a non- 



