CHAPTER VI 



ANAPHYLAXIS IN THE PRESENCE OF VARIOUS 

 SUBSTANCES! 



Anaphylaxis in the presence of tissue extracts — Researches on' 

 crystallin; on spermatic fluid. Congestin, Crepitin — Vege- 

 table albumens, etc. — Bacterial anaphylaxis, active and 

 passive — Tuberculin reaction — Therapeutic anaphylaxis — 

 Applications of anaphylactic reactions. 



The facts detailed in the preceding chapters are for 

 the most part derived from the experimental study of 

 sera, milk, and egg-albumen. These facts, supported 

 by very careful and indisputable experiments, con- 

 stitute the basis of our present knowledge relating to 

 anaphylaxis and anti-anaphylaxis. 



But it is not only these substances that set up 

 the state of anaphylaxis; every substance that con- 

 tains an animal or vegetable albumen possesses this 

 power. Perhaps this latter also belongs to other 

 substances; at the present time we can make no 

 definite pronouncement on this point. 



At all events, it is the case that agreement respect- 

 ing these substances is not yet as fully established 

 as in the case of those so far studied. So, while 

 waiting for the points in dispute to be cleared up, 

 we think it will be useful to summarise in this same 

 chapter an account of the experiments relating to 

 tissue extracts, bacteria and their products, vegetable 

 albumens, etc. 



After the study of sera, that of tissue extracts is 

 fully demonstrated.^ 



1 We omit the discussion of anaphylaxis in the presence of 

 the red blood-corpuscles on account of its complex character. 



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