C. Hay Mureay 
301 
and thus they had appeared to him as two separate pairs of glands, 
although Dufour suggested that one pair perhaps acted as a reservoir. 
(The saliva of the bug is said to be the cause of the swelling which 
occurs when a victim has been “ bitten.” The writer’s own experience 
is that there was no discomfort whatever when the lancets were being 
inserted (except in one case which may have been caused by the stylets 
touching a small surface nerve) and there was no after discomfort even 
with a “ bite ” of five minutes’ duration unless the place was rubbed. 
A single rubbing suffices to start the irritation, and the marks remain 
visible for about a fortnight; the last sign to disappear being a red 
mark showing the exact spot where the lancets had penetrated.) 
