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DOCTOR HOPKINS REACHES RETIREMENT AGE 
On August 31, 1931, Doctor A. D. Hopkins retired under thewage 
limitation of the Retirement Act of May 29, 1950, and on Sept. 1 he was 
appointed collaborator without compensation. 
Doctor Hopkins became associated with the Bureau in 1902 when as 
a special agent he was assigned to investigate certain forest insects. 
Tn July, 1904, he was placed in charge of the newly established Division 
of Forest Insects. In organizing and developing work of this division he 
laid the foundation for our future work in this important field and 
became generally recognized as the father of forest entomology in America. 
More recently he became intensely interested in bioclimatics and 
in 1923 relinquished his connection with the Division of Forest Insects 
to devote his entire time to investigations in this field, which involve 
studies of the broader phases of the relations between insects and en—- 
vironmental conditions affecting their development and abundance. During 
these later years he has published a number of papers giving preliminary 
results of his observations and has done much to develop the science of 
bioclimatics. A more comprehensive publication on bioclimatics is now 
being completed and the first volume should go to the printer within the 
comparatively near future. The Department has given its approval to the 
outside publication of this work. 
Although Doctor Hopkins has retired in accordance with provision 
of the law, such retirement is in name only. He is still both mentally 
and physically active and proposes to devote practically his entire time 
to the continuation of his investigation on bioclimatics. In appointing 
him as a collaborator the Bureau expects that he will maintain the same 
general relation to the work on bioclimatics that he has in the past. 
Since his transfer to the field service in 19235 he has established, 
at his own cost, a laboratory and experimental grounds on his property on 
the Little Kanawha River near Parkersburg, W. Va., and he hopes that this 
will become a permanent station for the study of bioclimatics, not only 
in relation to insects and their control but in relation to plants and 
farm practices generally. 
