Fig. 4. Specific reactions following intracutaneous test doses of fungus vaccines. A and 

 B, the usual eczematous type of reaction after 48 hours, showing similar responses to different 

 brands of trichophytin. No reactions resulted from the tests with antigens of other micro- 

 organisms. C, immediate wheal type of reaction observed 10 minutes after the injection of 

 trichophytin, showing the irregular wheal of a size greatly increased over that produced by 

 the injected fluid. A control injection of saline solution elicited a negative response. D, the 

 site of an immediate wheal response shows no visible reaction when observed after 4<S hours. 



25 



