ARACHNID A, MYRIOPODA, AND PERIPATUS. 103 
or fallen tree-trunks or damp decaying leaves in localities sheltered 
from the sun, but supplied with abundance of moisture. 
Preservation.— Great care must be taken in killing specimens of 
Perivatus. The most satisfactory method is drowning in water. 
To hasten the process a few drops of ammonia may, if desired 
be added to the water. If, while still alive, the animal be plunged 
direct into alcohol or any other preservative fluid, the body and 
limbs contract and the tissues shrink, so that the specimen is 
rendered less valuable for museum or anatomical purposes. During 
the process of drowning the body becomes fully distended. In this 
state it may be transferred to alcohol. 
