2H REMARKABLE REACTION OF THE TYPHOID BACILLUS. 



on notepapei", to distingaiish whether the illness from which a. 

 person may be suffering is typhoid fever or some other disease. 

 This is possible even when the ease is so obscure as to render the 

 results of all other methods of examination uncertain. Further- 

 more, specimens so taken may be sent by post and examined 

 days afterwards by an observer hundreds of miles distant. In- 

 deed, I have obtained the reaction with perfect distinctness from 

 specimens eight weeks old. This is a result at Avhich no one can 

 be more astonished than I have been myself. For it comes to 

 this — that an observer here should be able, were it worth while, 

 to recognise the presence of typhoid fever in persons residing in 

 London, l^erlin, or New York, on receiving such specimens 

 through the post.''' 



* Since this was written, I have obtained typical reactions from dried siaecimens 

 of blood of patients suffering from typhoid fever in London, forwarded to me by 

 letter post. 



