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of the

National Research Council

The Proceedings of the National Academy of Sciences has been designated as the official organ of the National Research Council for the publication of accounts of research, committee and other reports, and minutes.

Subscription rate for the “Proceedings” is $5 per year. Business address: Home Secretary, National Academy of Sciences, Smithsonian Institution, Washington, D. C.

The Bulletin of the National Research Council presents contributions from the National Research Council, other than proceedings, for which hitherto no appropriate agencies of publication have existed.

The “Bulletin” is published at irregular intervals. The subscription price, postpaid, is $5 per volume of approximately 500 pages. Numbers of the “Bulletin” are sold separately at prices based upon the cost of manufacture (for list of bulletins see third cover page).

The Reprint and Circular Series of the National Research

Council renders available for purchase, at prices dependent upon the cost of manufacture, papers published or printed by or for the National Research Council (for list of reprints and circulars see third cover page).

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Orders for the “Bulletin” or the “Reprints and Circulars” of the National Research Council, accompanied by remittance, should be addressed: Publication Office, National Research Council, 1201 Sixteenth Street, Washington, D. C.

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PUBLISHED BY THE NATIONAL RESEARCH COUNCIL

OF
THE NATIONAL ACADEMY OF SCIENCES

WASHINGTON, D. C.

1919-1921

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