BULLETIN 39, UNITED STATES NATIONAL MUSEUM. [10] 
the exact contour of the nest mold, especially where from want of space 
a number are packed on top of each other. Where the inner lining of 
nests consists principally of feathers or fur, a small quantity of naph- 
thaline should be sprinkled among them to keep moths and insects away ; 
otherwise many interesting Specimens are soon destroyed by such 
pests. The nest belonging to each set of eggs should be labeled simi- 
larly and the label attached to the side of the nest. Many collectors 
keep each set of eggs in the respective nests, but, unless the collection 
is a small one and excellent care is taken of it, this is not advisable, as 
many nests are more or less damp when taken and are apt to become 
moldy, affecting the eggs in a like manner. 
It is not the intention to give instructions through this circular just 
where to look for the nests of our birds. An observant odlogist can 
soon find out the different modes of nidification by watching the species 
found in his vicinity. 
o 
