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TORREYA

AND

NATURE-STUDY REVIEW

Special combined price $1.50 for the year 1909
Regular price $1.00 each

This special offer is good only as long as the publishers of the above journals can supply back numbers of early 1909 issues. In no case will the subscription be extended beyond December of this year. The offer is limited to new subscribers of either journals and also is not open to members of the American Nature-Study Society, of which THE NATURE-STUDY REVIEW is the official journal free to members. By later sending 25 cents additional to the Secretary of the Society the subscription on above terms may be credited as member's fee for the American Nature Society for 1909.

Correspondence relating to above special

offer should be addressed to

DR. WILLIAM MANSFIELD

College of Pharmacy

115 W. 68th Street

New York City

OTHER PUBLICATIONS

OF THE

TORREY BOTANICAL CLUB

(1) BULLETIN

A monthly journal devoted to general botany, established 1870. Vol. 35 published in 1908, contained 608 pages of text and 40 full-page plates. Price $3.00 per annum. For Europe, 14 shillings. Dulau & Co., 37 Soho Square, London, are agents for England.

Of former volumes, only 24-34 can be supplied entire; certain numbers of other volumes are available, but the entire stock of some numbers has been reserved for the completion of sets. Vols. 24-27 are furnished at the published price of two dollars each; Vols. 28-35 three dollars each.

Single copies (30 cts.) will be furnished only when not breaking complete volumes.

(2) MEMOIRS

The MEMOIRS, established 1889, are published at irregular intervals. Volumes 1-11 and 13 are now completed; Nos. I and 2 of Vol. 12 and No. 1 of Vol. 14 have been issued. The subscription price is fixed at $3.00 per volume in advance. The numbers can also be purchased singly. A list of titles of the individual papers and of prices will be furnished on application.

(3) The Preliminary Catalogue of Anthophyta and Pteridophyta reported as growing within one hundred miles of New York, 1888. Price, $1.00.

Correspondence relating to the above publications should be addressed to

DR. WILLIAM MANSFIELD

College of Pharmacy

115 W. 68TH STREET

NEW YORK CITY

THE TORREY BOTANICAL CLUB

OFFICERS FOR 1909

President

HENRY H. RUSBY, M.D.

Vice-Presidents

EDWARD S. BURGESS, PH.D. JOHN HENDLEY BARNHART, A. M., M.D.

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TORREYA is furnished to subscribers in the United States and Canada for one dollar per annum; single copies, fifteen cents. To subscribers elsewhere, five shillings, or the equivalent thereof. Postal or express money orders and drafts or personal checks on New York City banks are accepted in payment, but the rules of the New York Clearing House compel the request that ten cents be added to the amount of any other local checks that may be sent. Subscriptions are received only for full volumes, beginning with the January issue. Reprints will be furnished at cost prices. Subscriptions and remittances should be sent to TREASURER, TORREY BOTANICAL CLUB, 41 North Queen St., Lancaster, Pa., or College of Pharmacy, 115 West 68th St., New York City. Matter for publication should be addressed to

JEAN BROADHURST

Teachers College, Columbia University
New York City

Vol. 9

EXPERIMENTS

TORREYA

June, 1909

No. 6

UPON DROSERA ROTUNDIFOLIA

AS TO ITS PROTEIN-DIGESTING POWER

BY WINIFRED J. ROBINSON

A repetition, with some extensions, of a part of Darwin's exhaustive series of experiments on the digestive power of the leaves of Drosera rotundifolia was undertaken with the purpose of ascertaining whether the purer proteins now available would give any different results from those obtained by Darwin with tissue fragments or crude protein materials, solid and liquid. The experiments were carried on at the New York Botanical Garden under the direction of Professor William J. Gies, of the College of Physicians and Surgeons of Columbia University.

The plants used were collected in the bogs near Lakewood, N. J., in July, 1907. They were planted in sphagnum at the propagating house of the New York Botanical Garden, where they were kept continuously except when certain of their number were brought to the laboratory of the garden for a short time for observation.

The proteins used were prepared at the College of Physicians and Surgeons under the direction of Professor Gies with the exception of the nucleoprotein, which was extracted from compressed yeast by Professor Gies's method, in the laboratory of the New York Botanical Garden.

To insure accuracy in the records of the experiments a diagram of the arrangement of the leaves of the plant was made. in each case, the point on a leaf where a protein particle was placed being indicated on the diagram by an ink spot. Observations of the plants brought to the laboratory were made at intervals of from ten to thirty minutes during the first half day, [No. 5, Vol. 9, of TORREYA, comprising pages 89-108 was issued April 30, 1909.]

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