SCIENCE— ADVERTISEMENTS 



The Sarah Berliner 



Research Fellowship 



for Women 



A fellowship of the value of one thous- 

 and dollars is ofiEered annually, available 

 for study and research in physics, chem- 

 istry or biology. Applicants must already 

 hold the degree of doctor of philosophy or 

 be similarly equipped for the work of[fur- 

 ther research. Applications must be re- 

 ceived by the first of February of each 

 year. Further information may be ob- 

 tained from the chairman of the committee, 



Mrs. Christine Ladd-Franklin, 527 

 Cathedral Parkway, New York. 



JUST PUBLISHED 



The Theory of Maxima 

 and Minima 



By HARRIS HANCOCK 



University of Cincinnati 



A volume prepared for the use of 

 seniors and all who wish a course in 

 the calculus introductory to graduate 

 work in mathematics. It aims to 

 renovate thoroughly a subject into 

 which have crept many errors of 

 reasoning and practice. The book 

 contains a large number of examples, 

 problems, and exercises taken U'om 

 algebra, geometry, mechanics, and 

 physics. 



\193 pages, with diagrams, $2,50 



GINN AND COMPANY 



Boston 

 Now York 

 Chicaao 

 London 



Atlanta! 



Dallas 



CdiunbuB 



S an Francisco 



Catalogue of the Hemiptera of 

 America North of Mexico 



ExceptiDK the 

 Aphididae, Coccidae and Aleurodidae 



By Edward P. Van Duzee aoth, $5.60 



A Metbod for the Measurement of Self and Mninal 

 Inductances, by Fred. E. Pemot 05 



An Unusual Extension of the Distribution of the 

 Sblpworm in San itanclsco Bay, California, by 



Albert L. Barrows .■.'■■. 20 



OB_the ^Orientation of JBrvtfiropsis, by Charles A. 



Kofoid and Olive Sweey 15 



Crithidia JEuryophthalmi, sp. noT. from the Hem- 



Ipteran Bug, JEwrvophtJvalmus Convivus, Stal, 



by [Irene MoCulloch 15 



The University of California issues publications in the followitf g 

 Beri es among others: jjAgriculfural Sciencesjil American Axchae- 

 ology and Ethnology; Botanyt Economics; Entomology; Geog- 

 raphy ; Geology ; Mathematics ; -jPathologyl; Physiology ;lP8y- 

 chology; Zoology; MembiW of the University Jof, California ; 

 Bulletin and Publications of th6;LickjOb3ervatory. 



Complete lists'.of titles and pricesTwiU'^be sent on request. 



UNIVERSITY OF CALIFORNIA PRESS ^^ 

 Berkeley, California ~ ]280 Madison Ave., New York 



Marine Biological Laboratory 



Woods Hole, Mass. 



INVESTIGATION 

 Eatiro Year 



INSTRUCTION 



July 3 to August 13 



FaoOitaeB for research In Zoologjr, 

 Embryology, PhysJology and Bot- 

 any. Seventy-flii private labora- 

 tories. SlOO each for not over three 

 months. Thirty tables are avail- 

 able for beginners in researoh who 

 desire to work under the direction 

 of members of the staff. The fee 

 for such a table is $50.00 



Courses of laboratory instruction 

 with lectures are offered in Inverte- 

 brate Zoology, Embryology, Physi- 

 ology and Morphology and Taxo- 

 nomy of the Algae. Each course 

 requires the full time of the student. 

 Fee, $60. A lecture course on the 

 Philosophical Aspects of Biology 

 and Allied Sciences is also offered. 



SUPPLY 

 DEPARTMENT 



Op«n tha Entire Year 



Animals and plants, preserved, liv- 

 ing, and in embryonic stages. 

 Preeerved material of all types of 

 animals and of Algae, Fungi, Liver- 

 worts and Moiaes fumiahed for 

 (da^work, or for the musexun. 

 Living material furnished In season 

 as ordered. Price lists of Zoological 

 and Botanical material sent on ap- 

 plication. State which is desired. 

 For price lists and all informatioQ 

 regarding material, addrsst 



GEO. M. GRAY, Curator, Woods Hole. Man. 

 Tha Annual announcement will be sen i on appUcation to The 

 DireotOT, Marine Biological laboratory, Woods Hole, Msss. 



