February 9, 1959

Dept. of Agriculture
Science Service
Forest Biology Laboratory
College Hill
Fredericton
New Brunswick

Atten: Dr. R. E. Balch

Dear Dr. Balch:

I am sincerely grateful to you for the wealth of information and suggestions in your letters of January 15th and 26th. Meanwhile the large collection of reprints arrived, supplying much information that I shall be glad to have.

Last summer I had the pleasure of talking to Dr. Robert Rudd when he visited us in our summer home in Maine, as he was enroute to Canada. From Dr. Rudd, himself, and from Fairfield Osbourne, of the Conservation Foundation, I have heard about the study he is making for them. Dr. Rudd's proposed book is to be written for those professionally engaged in insect control, whereas mine is directed to the general public so actually there is no overlapping. Dr. Rudd is with the Dept. of Zoology, University of California, Davis, California.

Thank you for your suggestion on the subject of water pollution. I have had some correspondence on this subject with Dr. H. G. Hanson, Director of the Robert E. Taft Sanitary Engineering Centre. I am glad to know that another conference on this subject is to be held this year.

I shall undoubtedly be in touch with you again as my work progresses.

RLC/tg

January 9, 1959

Dr. R. E. Balch
Forest Biology Laboratory
College Hill
Fredericton, N. B.

Dear Dr. Balch:

Please accept my belated thanks for
your good letter of November 24th, and for your
reprint -- also for mentioning my interests to
Dr. Webb, who also sent a reprint. Because of
a death in my family, I have been away from my
work for several weeks, hence my tardy reply.

Of course I shall send you word of the
publication of my material, but I am sure the book
will not be out before fall. As you will under-
stand, any comprehensive review, that attempts to
give some perspective on the whole problem, is a
very large undertaking that requires time.

I wonder whether you may have available reprints
of any others of your papers cited in the bibliography
of your summary in the Annual Review of Entomology.
If so, I should greatly appreciate receiving them.

Your discussion of biological control
through animals seldom considered in this respect
interested me vey much -- shrews, bats, birds, ants, etc.
I gather that the principal interest in such agents
of control exists in Germany and other European
countries. I suppose that in America -- certainly in
the United States -- it would be thought results
would be too slow and incomplete. However, my own
feeling is that all possible alternatives or supple-
ments to chemical control must be explored if we are
to be saved from catastrophic alteration of our
environment,

My renewed thanks for your interest and
help.

Sincerely yours,

CANADA

DEPARTMENT OF AGRICULTURE

SCIENCE SERVICE

FOREST BIOLOGY LABORATORY

November 24, 1958

QUOTE FILE

Rachel L. Carson
11701 Berwick Rd.
Silver Spring, Maryland

Dear Miss Carson:

I have your letter of November 20, and I am glad to enclose a copy of my paper on "Control of Forest Insects" in the Annual Review of Entomology, 1958. I have greatly enjoyed reading your books and am an admirer of your knowledge and style as an author. I therefore consider it a privilege to help supply you with some information on the ecological effects of insecticides.

I also enclose a reprint of the following paper:

Balch, R. E., F. E. Webb, and J. J. Fettes. The use of aircraft in forest insect control. Forestry Abstracts 16(4); 17(1&2). Leading Article Series No. 23. 1955-56.

I think the section on assessment of results of aerial spraying may interest you.

If you wish further information with particular reference to agricultural entomology, I suggest you write to Mr. A. D. Pickett, Head, Entomology Section, Science Service Laboratory, Experimental Farm, Kentville, N. S.

REB:RMB

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