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ed a second clan matter at the post office at Baltimore, Maryland, under the act of August, 24, 1912. Acceptance for mailing at special speciasisga rate of postage provided for in Section 1103, Act of October 3, 1917. Authorized on July 3, 1918.

Price per annum, $5.00

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THE PROCEEDINGS is the official organ of the Academy for the publication of brief accounts of important current researches of members of the Academy and of other American investigators, and for reports on the meetings and other activities of the Academy. Publication in the Proceedings will supplement that in journals devoted to the special branches of science. The Proceedings will aim especially to secure prompt publication of original announcements of discoveries and wide circulation of the results of American research among investigators in other countries and in all branches of science. ARTICLES should be brief, not to exceed 2500 words or 6 printed pages, although under certain conditions longer articles may be published. Technical details of the work and long tables of data should be reserved for publication in special journals. But authors should be precise in making clear the new results and should give some record of the methods and data upon which they are based. The viewpoint should be comprehensive in giving the relation of the paper to previous publications of the author or of others and in exhibiting where practicable, the significance of the work for other branches of science.

MANUSCRIPTS should be prepared with a current number of the Proceedings as a model in matters of form, and should be typewritten in duplicate with double spacing, the author retaining one copy. Illustrations should be confined to text-figures of simple character, though more elaborate illustrations may be allowed in special instances to authors willing to pay for their preparation and insertion. Particular attention should be given to arranging tabular matter in a simple and concise manner.

REFERENCES to literature, numbered consecutively, will be placed at the end of the article and short footnotes should be avoided. It is suggested that references to periodicals be furnished in some detail and in general in accordance with the standard adopted for the Subject Catalogue of the International Catalogue of Scientific Literature, viz., name of author, with initials following (ordinarily omitting title of paper), abbreviated name of Journal, with place of publication, series (if any), volume, year, inclusive pages. For example: Montgomery, T. H., J. Morph., Boston, 22, 1911, (731-815); or, Wheeler, W. M., Königsburg, Schr. physik, Ges., 55, 1914, (1-142).

PAPERS by members of the Academy may be sent to Edwin Bidwell Wilson, Managing Editor, Mass. Institute of Technology, Cambridge, Mass. Papers by non-members should be submitted through some member.

PROOF will not ordinarily be sent; if an author asks for proof, it will be sent with the understanding that charges for his corrections shall be billed to him. Authors are therefore requested to make final revisions on the typewritten manuscripts. The editors cannot undertake to do more than correct obvious minor errors.

REPRINTS should be ordered at the time of submission of manuscript. They will be furnished to authors at cost, approximately as follows:

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(The charge for fewer than 100 copies is practically the same as for 100.)

Copyrigh, 1919, by the National Academy of Sciences

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MINUTES OF MEETINGS OF THE EXECUTIVE BOARD.........50, 91, 299, 360, 462, 532, 603

MINUTES OF JOINT MEETINGS OF THE EXECUTIVE BOARD WITH THE COUNCIL OF THE

ACADEMY..

ORGANIZATION OF THE NATIONAL RESEARCH COUNCIL...

EXECUTIVE ORDER ISSUED BY THE PRESIDENT OF THE UNITED STATES.
NATIONAL RESEARCH FELLOWSHIP IN PHYSICS AND CHEMISTRY...
MEETINGS OF THE INTERIM COMMITTEE......

ORGANIZATION OF DIVISIONS OF SCIENCE AND TECHNOLOGY.
SOME PROBLEMS OF SIDEREAL ASTRONOMY....

184

188

313

447, 459, 469, 528, 599

316

.By Henry Norris Russell 391

PERTURBATIONS AND TABLES OF THE MINOR PLANETS DISCOVERED BY JAMES C. WATSON

By Armin O. Leuschner 67
EVIDENCE OF STREAM MOTION AFFORDED BY THE FAINT STARS NEAR THE ORION NEBULA

By Adriaan van Maanen 225

ON THE USE OF THE SPECTROSCOPIC METHOD FOR DETERMINING THE PARALLAXES OF
THE BRIGHTER STARS..
.By W. S. Adams and G. Strömberg 228

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