SCIENCE— ADVERTISEMENTS 



THE 

 PRINCIPLES OF 



STRATIGRAPHY 



BY 

 AIVL\DEUS W. GRABAU, S.M., S.D. 



PROFESSOR OF PALEONTOLOGY IN 

 COLUMBIA UNIVERSITY 



"Should be on the reference shelf of every col- 

 lege, normal school, and large high school in the 

 United States." — Journal of Geography, Vol. XIII, 

 Jan. 1915. 



«oo, IISO pasts, 264 illattration: Price, $7.50 



Deacriptive Circalar Sent apon Request 



k. G. SEILER & CO. 



NEW YORK CITY 



The American Academy 

 of Arts and Sciences 



28 Newbury Street, Boston, Mass. 



Just issued. Proceedings, VoL 62, Nos. 9, 10, 11. 



52. 11. Crozier. W. J. — Ou the Pigmentation of a PoIt- 

 clad. Pp. 723-730. 1 col. pL May, 1917. 40 cents. 



52. 10. Thaxter, Roland. — New Laboulbeniales, chiefly 

 Dipterophilous American Species. Pp. 647-721. May, 1917. 

 SI. 00. 



52. 9. Bridgman, P. W. — The Electrical Resistance ot 

 Metals under Pressure. Pp. 571-646. Febraary, 1917. 90 cents. 



Other recent issues of the PTOceedlJi£l 



62. 8. Wheeler, William Morton. — The Mountain Ants 

 of Western North America. Pp. 455-569. January, 1917. S1.25. 



52. V. Hitchcock, Frank Lauren.— A Classification of 

 Quadratic Vectors. Pp. 369-454. SI. 25 



52. 6. WUson, E. B., and Moore, C. L. E. — Diflferential 

 Geometry of Ttvo Dimensional Surfaces in Hyperspace. Pp. 

 267-S6S. November, 1916. $1.50. 



52. 5. Walton, A. C— The 'RefractiTO Body' and the 

 ' Mitochondria ' of Ascaris canis Werner. Pp. 253-266. 2 pis. 

 October, 1916. 40 cents. 



52. 4. Pierce, George W. — Theoretical Investigation of 

 the Radiation Characteristics of an Antenna. Pp. 189-252. 

 October, 1916. Sl.OO. 



52. 3. Bridgman, P. W. — Polymorphism at High Pres- 

 sures. Pp. 89-187. July, 1916. Sl.OO. 



52. 2. Bridgman, P. W. — The Velocity of Polymorphic 

 Changes between Solids. Pp. 55-88. July, 1916. 60 cents. 



62. 1. Thaster, Roland. — New or Critical Species of 

 Chitonomyces and Rickia. Pp. 1-54. June, 1916. 70 cents. 



Mitosis in Giardia microti, by William C. Boeck, 

 35 cents. 



Minerals Associated with the Crystalline Limestone 

 at Crestmore, Riverside County, California, by 



Arthur S. Eakle, 40 cents. 



Description of Some New Species of Polynoidae from 

 the Coast of California, by Christine Essenberg 20 



Optimnm Moisture Conditions for Tonng Lemon 

 Trees on a Loam Soil, by L W. Fowler and C. B. 

 Lipman .15 



Some Abnormal Water Belations In Citrus Trees of 

 the Arid Southwest and their Possible SIgnlfleance, 



by Robert W. Hodgson 30 



New Species of AmphtnomiJae from the Pacific Coast, 



by Christine Essenberg 15 



The University of California issnes publications in the follow- 

 ing series among others: Agricultural [Sciences; American 

 Axchffiology and iEthnology ; Botany; Economics; Ento- 

 mology ; Geology ; Mathematics ; Pathology ; Philosophy ; 

 Physiology .Psychology; Zoology; Memoirs of the University of 

 California; Bulletin and Publications of the Liok Observatory. 



Complete lists of titles and prices will be sent on request. 



•UNIVERSITY OF CAUFORNIA PRESS 



Beikeley, California 280 Madison Ave., Nevf York 



The Ellen Richards Research Prize 



The Naples Table Association for Promoting 

 Laboratory Research by Women announces the offer 

 of a research prize of $1000.00 for the best thesis 

 written by an American woman embodying new ob- 

 servations and new conclusions based on independent 

 laboratory research in Biology (including Psy- 

 chology), Chemistry or Physics. Papers published 

 before 1916 will not be considered and theses pre- 

 sented for a Ph.D. degree are not ehgible. Theses 

 offered in competition must be in the hands of the 

 Cheurman of the Committee on the Prize before 

 February 25, 1918. AppUcation blanks may be ob- 

 tained from the secretary, Mrs. Ada Wing Mead, 

 823 Wayland Avenue, Providence, R. I. 



OPTIC PROJECTION 



Principles, installation and use of the Mag'c Lantern, Opaque 

 Lantern. Projection Microscope and Moving Picture Machine; 

 700 pages, 400 figs. By Simon Henbt Gaqb, B.S., and 

 Hbnbi Phelps Gage, Ph.D. Postpaid, S3.00. 

 THE COMSTOCK PUBLISHING CO., Ithaca, N Y. 



MARINE BIOLOGICAL LABORATORY 



WOODS HOLE, MASS. 



Biological Material 



1. Zooiosry. Preserved material of all types of animals 

 for class work and for the museum. 



2. Embryology. Stages of some invertebrat.e8, fishes (in- 

 cluding Acanthias, Amia and Lepidosteus), Amphibia, and 

 some mammals. 



3. Botany. Preserved material of Algae, Fungi, Liver- 

 worts and Mosses. Price lists furnished on application to 



GEORGE M. GBAY, Curator, Woods Hole, Mass. 



