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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 16 
also say that too many entomologists want to pay no attention to any¬ 
thing that is not a bug. 
It is true that within the group of insects alone you can find brilliant 
examples illustrating all the major principles of evolution. Nowhere are 
there such striking examples of adaptations, variations, and those 
gradatory series of species that spell evolution to anyone who looks at 
them. All of these conditions of animal life are splendidly illustrated in 
insects. Perhaps influenced by twenty-five or thirty years of association 
with insects, I believe that more basic principles of evolution are beauti¬ 
fully illustrated among insects than in any other group of animals. 
But I did not hesitate, especially in my undergraduate years and 
graduate years, to try always to realize that if I shut myself up alone 
with my insects I was going to miss knowing something about them that 
I could find out by looking elsewhere at other forms of life. 
I got this first broadening glimpse when I went to work with Prof. 
Comstock, because he was using insects as illustrations of great principles 
of evolution. And then I got even perhaps a more broadening view of 
what one could do in the way of studying insects, when I went to the 
University of Leipzig and worked with famous old Professor Leuckart 
there. He was perhaps the greatest parasitologist that ever lived, and 
insects to him meant parasites; but there were so many insects that 
were parasites that he always, in his great courses of comparative 
anatomy and general zoology, gave insects their due place, although 
always in relation to the rest of animal life and even of plant life. And 
when one says plant life, that brings a suggestion with a special signifi¬ 
cance to this group of economic entomologists, because so much of 
your work is the attempt to save useful plants from injury by insects. 
And how are you going to do this soundly without knowing something 
about the habits and the anatomy and the growth and life history of these 
plants that you are trying to save? You are not going to do it simply 
by knowing the insects alone. 
Mr. Moore has just called your attention to the advantages, aye, the 
necessity, of having, on your part, some knowledge of chemistry if you 
are to be effective economic entomologists. And that brings clearly to 
me just now something that was impressed on me two or three days ago 
when I helped to celebrate the Pasteur Centenary Celebration in Phila¬ 
delphia. 
Pasteur did the great things he did in biology because he also did great 
things in chemistry. We are not, most of us, going to be Pasteurs, but 
we can take a leaf from his book and analyze his method of work. He 
