MOLES, SHREWS AND BATS — 205 
most animals the bat acts as host to a few small 
insect parasites, one of which is a relative of 
the bedbug and somewhat resembles it. It is 
possible that at rare intervals one may be 
found carrying a true bedbug, which is not one 
of its natural parasites, and might drop it in 
some garret; but the danger from this is slight. 
Bats are naturally cave-dwellers, and certain 
caves favorably situated in wild regions have 
been tenanted by them in enormous numbers 
and for an untold length’ of time. In such 
caverns, discovered in‘ various parts of world, 
thick deposits of guano have been found, and 
have to some extent been utilized, being ex- 
ceedingly strong in nitrogenous elements and 
unimpaired, in their protected situation by the 
washing away of the soluble elements in which 
their virtue largely lies. 
