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7. The device may, of course, be made in any desired size but the dimensions given seem the most convenient, and the acircular shape of the base facilitates locating index a. Indelibility is obtained by engraving the lines with a steel point and filling with India ink. 8. Illustrations of the use of this compound circular slide rule are given above.

C. M. KELLEY PSYCHOLOGICAL LABORATORY OF MCLEAN HOSPITAL

MEETING OF COMMITTEES ON

CONSERVATION

COMMITTEES on Conservation appointed by the National Academy of Sciences, the National Research Council, and the American Association for the Advancement of Science met jointly in the American Museum of Natural History, New York City, April 9, to consider the present status of the conservation movement from the point of view of science, means for increasing the coordination of the numerous agencies interested in the various aspects of conservation, and particularly the far-reaching relation of the principles of the conservation of natural resources to the economic and social welfare of the country. The members present at this meeting were: J. C. Merriam, chairman of three committees, Isaiah Bowman, J. McK. Cattell, John M. Clarke, Henry S. Graves, Vernon Kellogg, C. E. McClung, and Barrington Moore, and by invitation Willard G. Van Name.

The point of view of the committees and the major considerations discussed at this meeting are stated in an address which Mr. Graves presented at this meeting and which is published in full elsewhere in this issue of SCI

ENCE.

It was the unanimous opinion of the members of the committees that an organization should be effected representing the scientific men of the country, and that the functions of this organization, broadly speaking, should be as follows:

1. To bring scientific research to bear more effectively upon the problems of conservation.

This involves the extension among research men of a knowledge of the scope, the objectives, and the economic problems of conservation, and the assurance that in the studies of each resource there is an appreciation of its relation to other resources, and the correlation of the programs of research in each field of work.

2. To assemble the available data relating to our natural resources, and the interpretation of these data from the standpoint of conservation and of the relation of the problems of the various resources, severally and taken together, to the economic, industrial, and social welfare of different regions and of the nation as a whole. This work is essential for an adequate definition of our conservation problems, and to furnish the economic background for the many proposals for public action by the states and by the federal government.

3. To bring about the introduction in our educational institutions of instruction in the principles underlying conservation. The plan of instruction should be subject to great variation in different institutions. The instruction might be given in connection with courses in economic or political and social science, or economic and industrial history, or in connection with various courses in engineering and applied science, or in special courses in conservation.

The undertaking would involve personal contact and cooperation with the institutions or educational organizations. It would involve further suggestions as to the preparation of text-books and special material for demonstration, such as charts, models and maps, and suggestions regarding the methods of instruction.

4. To effect leadership in a campaign of popular education as to the meaning of conservation, and the necessity for the adoption of its principles.

5. To bring into effective harmony the efforts of the different forces of the country concerned with conservation based upon scientific research which it is difficult for any of the existing agencies to effect.

The following resolution was adopted to be reported for approval to the National Academy of Sciences, the National Research Council, and the American Association for the Advancement of Science:

Resolved: That it be recommended by the committees appointed by the American Association for the Advancement of Science, the National Academy of Sciences, and the National Research Council that they form a continuing joint committee on national conservation representing those organizations, and that this committee be authorized to set up an executive and secretarial agency for the active prosecution of its work.

To carry forward the purposes of this resolution the following motions were passed:

Moved: That a Project Committee of three members be appointed by the chairman to draw up a plan of action to be presented to a Ways and Means Committee for execution.

Moved: That a Ways and Means Committee be appointed by the chairman to consist of one representative each from the National Academy of Sciences, National Research Council, and American Association for the Advancement of Science; and, conditioned upon the approval of the resolution just adopted, by these three organizations, to undertake (1) to secure means for meeting the comparatively small expenses of these three initial committees, and (2) to secure larger funds for the permanent support of a conservation movement as outlined in this discussion.

The resolution adopted by these committees has been approved by the Council of the National Academy of Sciences, the Executive Board of the National Research Council, and the Council of the American Association for the Advancement of Science at the recent meetings of those bodies and funds have been provided for defraying the immediate expenses of these committees.

ALBERT L. BARROWS,
Secretary, pro tempore

THE WESTERN SOCIETY OF NATURALISTS-SAN JACINTO SECTION THE San Jacinto Section of the Western Society of Naturalists held its spring meeting in San Diego and La Jolla, California, on Friday and

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Conklin, E. G. (Princeton University): "The chromosome theory of heredity applied to ontogeny and phylogeny."

Carsner, Eubanks (Bureau of Plant Industry, U. S. Dept. Agr.): "A serious disease of the sugarbeet in California.''

The society adjourned at 6:00 o'clock to the San Diego Hotel for the annual dinner and a short business meeting at which Dr. F. B. Sumner, of the Scripps Institution, La Jolla, was elected president for the coming year, and Dr. F. J. Smiley, of Occidental College, Los Angeles, reelected secretary. After the business meeting the following papers were presented:

Essenberg, Christine (Scripps Institution): "An interesting group belonging to the marine fauna of San Diego Bay."

Allen, W. E. (Scripps Institution): "Investigation of the ocean pasturage.''

Halma, F. E. (Citrus Experiment Station): "Regeneration of the roots of sour orange."

Barnhart, P. S. (Scripps Institution): "Observations on the habits of the trap-door spider.''

Saturday morning the section assembled in La Jolla and visited Torrey Pines Park, a reservation for the protection of one of California's rarest trees (Pinus Torreyana Parry). The afternoon was devoted to an inspection of the Scripps Collection of Watercolors illustrating the flora of California at the home of Miss Ellen Scripps, and to visiting the Scripps Institution.

The next meeting is to be held at the call of the president and secretary.

F. J. SMILEY, Secretary

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ADMISSION

Candidates for admission must be graduates of approved colleges or scientific schools with at least two year's instruction, including laboratory work, in Chemistry, and one year each in physics and biology, together with evidence of a reading knowledge of French and German.

Each class is limited to 90 students, men and women being admitted on the same terms. Except in unusual circumstances, applications for admission will not be considered after July 1st. If vacancies occur, students from other institutions desiring advanced standing may be admitted to the second or third year provided they fulfill all of our requirements and present exceptional qualifications.

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The charge for tuition is $250 per annum, payable in three instalments. There are no extra fees except for rental of microscope, certain expensive supplies, and laboratory breakage.

The annual announcement and application blanks may be obtained by addressing the

Dean of the Johns Hopkins Medical School Washington and Monument Sts. BALTIMORE, MD'

SUMMER WORK FOR GRADUATES
IN MEDICINE

Beginning Tuesday, June 6th, and ending Thursday, July 16th, a course in medical diagnosis, including laboratory exercises in clinical pathology and demonstrations in pathological anatomy, will be offered. The course will be limited to twenty students, fee $100. Applications should be made to the Dean's Office.

Louisiana

SCHOOL OF MEDICINE

(Established in 1834)

ADMISSION: All students entering the Freshman Class will be required to present credits for two years of college work, which must include Chemistry (General and Organic), Physics and Biology, with their laboratories, and at least one year in English and one year in a modern foreign language.

COMBINED COURSES: Premedical course of two years is offered in the College of Arts and Sciences, which provides for systematic work leading to the B.S. degree at the end of the second year in the medical course.

School of Pharmacy, School of Dentistry and Graduate School of Medicine also.

Women admitted to all Schools of the College of Medicine

For bulletins and all other information, address

Tulane College of Medicine

P. O. Box 770

New Orleans, La.

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INSTRUCTION

June 29 to August 9 1921

SUPPLY
DEPARTMENT

Open the Entire Year

Courses of laboratory instruction with lectures are offered in Invertebrate Zoology, Protozoology, Embryology, Physiology and Morphology and Taxonomy of the Algae. Each course requires the full time of the student. Fee, $75. A lecture course on the Philosophical Aspects of Biology and Allied Sciences is also offered.

Animals and plants, preserved, living, and in embryonic stages. Preserved material of all types of animals and of Algae, Fungi, Liverworts and Mosses furnished for classwork, or for the museum. Living material furnished in season as ordered. Microscopic slides in Zoology, Botany, Histology, Bac teriology. Price lists of Zoological and Botanical material and Microscopic Slides sent on application. State which is desired. For price lists and all information regarding material, address

GEO. M. GRAY, Curator, Woods Hole, Mase The annual announcement will be sent on application to The Director, Marine Biological Laboratory, Woods Hole, Mass.

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Yale University

SCHOOL OF MEDICINE

Affiliated with the New Haven Hospital
and New Haven Dispensary

109th Session

Reorganized on a full-time basis Entrance Requirements: A minimum of two years (or its equivalent) of college including general biology, physics, general and organic chemistry, physical chemistry or laboratory physics, and either French or German.

ALL OF THE GENERAL FACILITIES OF THE UNIVERSITY ARE AVAILABLE TO MEDICAL STUDENTS As the number admitted to each class is limited, applications must be made before July 1.

Dean, Yale University School of Medicine NEW HAVEN, CONN.

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CADMIUM STANDARD CELLS

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For use with potentiometers, electrometers, and ballistic galvanemeters, or wherever else a precision standard of electromotive force is needed.

Negligible Temperature Coefficient.
Highly Constant E. M. F.

Contents hermetically sealed in glass so that lowering of electromotive force due to evaporation is impossible.

Mounted in moulded box, or unmounted.

My comparison certificate accompanies each cell without charge.
Bureau of Standards certificate extra.

On November 13, 1916, three normal cadmium cells made by me were certified by the Bureau of Standards as differing from their group of reference cells by less than one part in one hundred thousand, all three having the same value.

On March 30 1920, after the lapse of three years and four months, the same three cells were again compared by the Bureau of Standards. The maximum difference among the three was less than one part per hundred thousand, and the maximum difference from their certified value of 1916, was less than one part per hundred thousand.

In other words, these cells showed a degree of constancy to all intents equal to that considered most highly satisfactory, if not remarkable, in the very best type of precision resistance standards. (see Bul. Bur. of Stand. Vol. 5, No. 3. D. 427.)

The cells in question were in nowise special. They were made of the materials regularly prepared by me, and were set up with no greater care than that constantly employed in the making of my standards.

Marion Eppley,

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COMPTON
QUADRANT
ELECTROMETER

PROBABLY THE MOST
SENSITIVE ELECTRO-
STATIC INSTRUMENT
AVAILABLE

IMMEDIATE DELIVERIES.

ASK FOR CATALOGUE 18.

PYROLECTRIC
INSTRUMENT CO.

PYROMETRIC AND ELECTRICAL
PRECISION INSTRUMENTS

636-640 EAST STATE STREET

TRENTON, N. J.

Central Electrical System of Compton Electrometer

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