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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 16 
knowledge of chemistry to see and to be able to solve the chemical 
problems which confront him in the use of insecticides. Co-operation 
between the entomological and chemical departments of our universities 
should make it possible for the student of entomology to obtain such 
a knowledge without spending considerable time in courses essential 
to the chemist but not so necessary to the entomologist. Analytic 
chemistry is such a course. It is more essential for the entomologist to 
have a knowledge of organic and physical chemistry than to be able to 
make qualitative and quantitative chemical analyses. Among the 
organic chemicals there are doubtless many new and important insecti¬ 
cides awaiting discovery. Insecticides are applied in the form of emul¬ 
sions, suspensions, and dusts, hence a knowledge of physical chemistry 
particularly that portion which treats “of bubbles, drops, grains, fila¬ 
ments, and films” generally known as colloid chemistry is most essential. 
THE ENTOMOLOGIST AND THE PUBLIC 
By W. C. O’Kane, Durham , N. H. 
Abstract 
Every entomologist comes into relation with the public. It is worth while re¬ 
cognizing this fact and turning it to good account. Bulletins, circulars and popular 
articles afford the widest contacts. Essentials for these are a ready command of 
vigorous English, a logical arrangement of material in bulletin or circular, the use of 
a summary, condensation and simplification of matter in popular publications, the 
use of readable type face, the employment of good illustrations, either photographs 
or line drawings, and attractive typography in general. Personal letters of inquiry 
should receive personal, direct answer. The county farm bureau and county agri¬ 
cultural agent can increase the value of the contacts and influence of the entomologist. 
Popular addresses, to be effective, require honest and adequate preparation. All of 
these things are worth while because they help to make the entomologist a useful 
servant of the public and a worthy representative of his science. 
Every entomologist, at some point in his work, bears some relation 
to the public, whether that public be the wide and miscellaneous people 
at large, or whether it be a more limited group, specifically interested in 
his work. I can think of no exception to this rule. 
Even the specialist, engaged in pure research, has occasion to make 
contacts, not only with other men engaged in the same science but 
with those who are interested only indirectly. He has letters to write, 
materials to discuss and papers to prepare. Not infrequently his reports 
are read by men who have no technical knowledge of his subject. He 
cannot, if he would, avoid these relationships. 
