: THE 
AMERICAN NATURALIST. 
VoL. XXII. MARCH, 1888. No. 255. 
MORPHOLOGY OF THE LEGS OF HYMENOPTER- 
OUS INSECTS." 
BY PROF. A. J. COOK, AGRICULTURAL COLLEGE, MICHIGAN. 
’ 
ACCORDIN G to our modern philosophy regarding the origin 
and development of animal organs and organisms, we should 
look at such organs as are much used in the animal economy to find 
extremes in modification. Thus among mammals the teeth are 
KY 
@.1. 
oar Paper was read before aaa Association for Advancement 
ence, in August, 1887, at N. Y. meeting. 
