SCIENCE-ADVERTISEMENTS 



THE 

 PRINCIPLES OF 

 STRATIGRAPHY 



BY 

 AMADEUS 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. 



8vo, tlSO paces, 264 itluttralionM. Pric; $7. SO 



D*>eriptiva Circular Sent npsn Request 



A. G. SEILER & CO. 



NEW YORK CITY 



American 



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have now the opportunity to nse in their 

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Volume I. Derivatives and Differentials, Definite 

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Volume II, Part I. Functions of a Complex Vari- 

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Part II. DiSerential Equations 



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Published by Ginn and Company, and obtainable 

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The Ellen Richards Research Prize 



The Naples Table Association for Promoting 

 Laboratory Eeaearoh 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- 

 ohology). Chemistry or Physics. Papers published 

 before 1916 will not be considered and theses pre- 

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

 offered in competition must be in the hands of the 

 Chairman of the Committee on the Prize before 

 February 25, 1918. Application blanks may be ob- 

 tained from the secretary, Mrs. Ada Wing Mead, 

 823 Wayland Avenue, Providence, R. I. 



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

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SCIENCE 



A WEEKLY JOURNAL DEVOTED TO THE AD. 



VANCEMENT OF SCIENCE 



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UNIVERSITY OF MANITOBA 



PROFESSORSHIP OF ZOOLOGY 



New Appointment 



The Board of Governors of the University of Manitoba 

 beg to announce the establishment of a chair of Zoology in 

 the University, for which they invite applications. The 

 duties will include the usual courses of lectures, laboratory 

 work and examinatioDS ; and the appointee will be ex- 

 pected to carry on research work. The first appointment 

 will be for one year, but on reappointment the tenure will 

 be for an indefinite term. The salary will be S3 000.00 per 

 annum. The board desires, if poesible, to date the appoint- 

 ment from September 1st, and the duties from September 

 l.=>th. Each applicant should send a full statement of his 

 career, two copies of each testimonial, one copy of eacli 

 original publication, full personal particulars, and a recent 

 photograph. Applications should be sent at early date to 



THE REGISTRAR, 



University of Manitoba 



Queen's University 



Kingston Ontario, Canada 



Applications will be received until August 1st, for the positions 

 of Assistant Professor of Physics and also of Lecturer in Physics, 

 duties to commence September 26th, 1917. 



GEO. Y. CHOWN, Registrar 



INSTRUMENT MAKER 



for a modernly equipped shop of a physical labora- 

 tory" in a large university. Salary |1200 to SI 500 

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