MECHANISM OF ANTIANAPHYLAXIS 157 



Not to be confounded with the antianaphylactic state proper 

 is the protection which may be afforded the sensitized animal by 

 various other procedures, such as the injection of peptone, of heterol- 

 ogous alien sera, and even of indifferent inorganic substances like 

 kaolin. Such protection in contradistinction to true antianaphyl- 

 axis is, however, not specific, does not develop abruptly, and rapidly 

 disappears while true antianaphylaxis persists for a much longer 

 time, and is within quantitative limits absolutely specific. 



