SCIENCE-ADVERTISi . 



Natural History Material 



ZOOLOGY GEOLOGY 



We have famished all kinds of Natural 

 History Material and apparatus to the leading 

 Museums, Colleges and Schools of the world, 

 for the past fifty years. We endeavor to 

 have our material of the best grade obtainable, 

 and our prices as low as the quality will per- 

 mit. We invite comparison of materials and 

 prices with those of all other dealers. To read- 

 ers of Science we are pleased to send our cata= 

 logues and price lists free. 



Recent Catalogues 



S29 : Microscope Slides 

 S28 : Zoological Supplies 

 S22: North American Birds 

 SI 06: Restorations of Fossils 



Ward's Natural Science 

 Establishment 



College Ave. Rochester, N. Y. 



UINIOP )i SOUTH AFRICA 



n i 'tmetit of Agriculture 

 Appointrneoi oi Assistant Entomologist 



Applications ni invited for the post of ASSISTANT 

 ENTOMOLOGIST fn the Department of Agriculture of the 

 Union of Soutl' AJi ica. "-^af 



Applicants for the post must have had a College o^ i-f.ation 

 embracing ea.omology and ullied natural science ' arses, 

 and muBt be ^pable of undertaking investigationB'jf isect 

 problems. Pactical experience in economic enton^ology 

 will be a reccajaeiidation. 



The ss.l«ry ttaching to the post commences at £350 per 

 annum and r p,^ subject to satisfactory service, by annual 

 incremeatg c 20 to a maximum of £450, but in the case of a 

 fully compet ; man the prospects of promotion to a higher 

 grade are goo' in certain districts a local allowance is pay- 

 able in aceoi' : ac« wi th the Regulations of the Public Service. 



The success- ii candidate will be required to serve on pro- 

 bation for a pe-iod of twelve months and will be expecte" 

 to acquire a k" o^riedge of the Dutch and English languag ; 

 within a reasc -able period. ^ 



Applications supported bjr certificates of birth, health, 

 character, edmation, previous employment or professional 

 qualificatioHS, tnd languages will be received by the under- 

 signed not latei than April 30, 1913. 



P. J. H. HOFMEYR, 

 Secretary Public Service Commission. 



Office ali th* f ublic Service Commission, 

 P. O. B«x S4S, Pretoria, S. A. 



ELEVENTH EDITION 



THE iVlICROSCOPE, 



an introduction to Microscopic Methods and to Histology, by 

 Simon Henkt GaGe of Cornell University. The 11th edition 

 has eight pages of lew matter and corrections, otherwise It is 

 like the 10th ed. I'rice $2.00 postpaid. 

 COMSTOCK F'UBLISHINQ CO., Ithaca, N. Y. 



Science and Education 



A Series of volumes for the promotion of scienti&e res ::]rch and educational progress 

 Volume I. The Foundations of Science 



By H. PoiNCAEE. Containing the authorized English translation by George Bruce 

 Halsted of "Science and Hypothesis,'' " The Vaiue of Science," and "Science 

 and Method. ' ' In press. 



Volume II. Medical Research and Education 



By Richard Mills Peaece, William H. Welch, C. S. Minot, and other authors. 

 In press. 

 Volume III. University Control. Now ready. 



Published March, 19x3. Pages x+484. Price, $3.00 net 



University Control 



By J. MoKeen Cattell, Professor of Psychology in Columbia University 

 Together with a Series of Two Hundred and Ninety-nin<i Unsigned Letters by Lead- 

 ing Men of Science holding Academic Positions and Articlet by Joseph Jastrow of the 

 University of Wisconsin, George T. Ladd of Yale University, John J. Stevenson of New 

 York University, J. E. Creighton of Cornell University, J. M^Keen Cattell of Columbia 

 University, George M. Stratton of the University of California Stewart Paton of Prince- 

 ton, John Jay Chapman of New York, James P. Munroe of Boston, and Jacob Gould 

 Schurman of Cornell University. 



THE SOIEINCE F>RB*SS 



GARRISON, N. Y. 



SUB-STATION 84, NEW YORK CITY 



LANCASTER, PA. 



