SCIENCE— ADVERTISEMENTS 



IX 



PROVIDENT TEACHERS' AGENCY 



120 Tremont Street BOSTON, MASS. 



We enroll and we recommend teachers and officers 

 for public and private schools, for normal and tech- 

 nical schools, and for colleges and universities. 

 Vacancies now for immediate service and for 1914- 

 15. Director, JAMES LEE LOVE, formerly of 

 Harvard Faculty. 



We Want to Buy 



complete sets of Myoologia, Phytopathology, North 

 American Flora. Other sets or good ones of scienti- 

 fic periodicals will be considered. 



INFERNaTIONAL nAQAZINE CO. 

 Elizabeth, N. J. 



The Nummulosphere. Part I 



Price, half a dollar. 



The Nummulosphere. Part 11 



The genesia of igneous rocks and of meteorites. 

 Price, quarter dollar. 



By R. KIRKPATRICK 

 Sold by Samley Co., 1 Exhibition Road, London, S. W- 



MARINE BIOLOGICAL LABORATORY 



WOODS HOLE, MASS. 

 Biuio^acal Material 



1. Zooloery. PreserTed mavtritl of all types of animali 

 for tiJSB work and for the museum. 



2. Embryology. Stages of some invertebrates, fishes (in- 

 cluding Acanthiaa, Amla and Lepldosteus), Amphibia, and 

 some mammals. 



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

 worts, and Mosses. Price lists furnished on application to 

 OEOROB M. PRAY. Curator, Woods Hole, Mass. 



ELEVENTH EDITION 



TUB MICROSCORE, 



an introduction to Microscopic Methods and to Histology, by 

 Simon Henry Gagk of Cornell University. The 11th edition 

 has eight pages of new matter and correctionH, otherwise it ia 

 like the 10th ed. Price $2.00 postpaid. 

 COMSTOCK PUBLISHING CO., Ithaca, N. Y« 



8 Grape Vines, 6 Currant Bushes 



All best 3 year old stock. If planted now or early spring ^ ^ 

 will fruit next summer. Should ground be frozen we Sh^ 

 tell you how to protect and keep them dormant ready ^^ 

 for early spring planting. Orders accepted now and forwarded 

 at any future time if preferred. Grapes are Worden, Niagara, 

 lona. Concord, the best early medium and late varieties. Large 

 eherry currants. Write for list of our $1 Friend Makers, con- 

 sisting of all kinds of Fruit Trees, Berries and Roses. 4^ 

 The Landscape Garden Co. Newburgh, N. Y. 



JULIEN'S POWER AND FOOT LATHES 



Use of Geologists, Mineralogists, Petrographers, Met- 

 allurgists, Mining Engineers, in SLICING and POL- 

 ISHING all hard substances, rocks, etc., and in prepa- 

 ration of MICROSCOPIC THIN SECTIONS. 



GUSTAVUS D. JULIEN 



3 Webster Terrace N EW ROCH ELLE, N. Y. 



gon Cameras 



THE CAMERA OF QUALITY" 

 with 



Rietzschel Double Anastigmats 



are the embodiment of all that is desirable in cameras. They are compact, small, and 

 light in weight, yet they are very reasotiable in price : ' ' They fit the Pocket. ' ' They 

 are made from miniature size up to 5x7 inches, in all styles. All are built of light but 

 indestructible metal ; all are leather covered ; all have leather bellows ; all have rising, 

 falling and cross front ; all have detachable lensboard ; all have quickly reversible 

 ground glass ; all are fitted with double anastigmats, the better ones with the finest 

 cemented lenses ever put on the market, in compound shutter. 



' We also sell 



OUR 1913 CATALOG 



Contains many new instmznentB, all | 

 new illustrations, lowest prices and ^ 

 \ valuable information of interest to every i 

 k science instructor. Send us your name . 

 ' and address an d we wil l send you a free ' 

 »copy. ^^^ Sales Dep't 



' Chicago Apparatus Co., Chicago. III. 



ERNEMANN 



Cameras, 

 Double Anastigmats and 

 Motion Picture Apparatus 



MEVER CAAIERA «Sr IINSTRUMBINT CO., Inc. 



18 West 27th Street, NEW VORK 



IMPORTERS OF AND DEALERS IN SCIENTIFIC INSTRUMENTS 



