SCIENCE— ADVERTISEMENTS 



THE CAMERA OF QUALITY 



with 



Rietzschel Doub'e Anastigmats 



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

 light in weight, yet thev aro very reasonable in price : " They fit the Pocket." They 

 are made from miniatuVe size up to 5 x 7 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 



ERNE/VIANN Cameras and Double Anastigmats 

 MBVER CAMERA «Sr IINSTRUIVIEINT CO., Inc. 



18 West 27th Street, NEW VORK 



IMPORTERS OF AND DEALERS IN SCIENTIFIC INSTRUMENTS 



THE 



Moscow Natural Eye Model 



Pat. Feb. 3, 1914. 



A Ne'w and Valuable Aid in Teaching Anatomy and 

 Physiology of the Eye 



These models consist of a real, natural eye 

 which has been hardened andlixed: then sectioned 

 in half and mounted in a glass cell bo as to show all 

 the internal parts of the eyeball. These structures 

 are all held in their normal positions, and may be 

 easily dentitied by means of the diagrammatic cut, 

 keyed to model, which accompanies each one. 



"Ihe Moscow Natural Eye Models are excellent 

 preparations. We find them to be a great help in 

 faborat')ry work, in Zoology. Physiology, Anatomy, 

 etc., etc ," Dr. J. E, Wodsedalek, Professor of Zoology, 

 University of Idaho. 



Mounted in ebonized box with hinged cover, 

 which protects the glass cell from injury. Absolute- 

 ly permanent, and fully guaranteed. 



Send for descriptive literature. 

 Manufactured by 



MOSCOW OPTICAL COMPANY 



MOSCOW, IDAHO. 



ELEVENTH EDITION 



THE A/IICROSCORB, 



on introduction to Microscopic Methods and to Histolo^, by 

 Simon Henry Gage of Cornell University. The 11th edition 

 has eight pages of new matter and corrections, otherwise it JB 

 like the 10th ed. Price 82.00 postpaid. 

 COMSTOCK PUBLISHINO CO., Ithaca, N. Y. 



PROVIDENT TEACHERS' AGENCY 

 120 Tremont Street BOSTON, MASS. 



We enroll and we recommend teacheni and officers 

 for public and private schools, for normal and tech- 

 nical schools, and for colleges and universitieB. 

 Vacancies now for immediate service and for 1914- 

 15. Director, JAMES LEE LOVE, formerly of 

 Harvard Faculty. 



CRYSTALLOQRAPHY 



Quartz Crystals from the Calciferous Limestone of 

 N. Y. State showing rare planes suitable for research 

 work, also doubly terminated crystals with micro- 

 inclusions of ore, moving particles of bitumen and 

 cavities with fluid. For sale by 



EDWARD S. LAW 



116 Waverly Plac- SCHENECTADY, N. Y. 



Corre^p'tndence Sollcltrd 



How 5000 Schools Save 



In Buying Scientific Apparatus 



Buy ing: direct from our factory saves money on 

 their laboratory Bupplies. One profit from makerto 

 school cutsout all extra selling and traveling ex- 

 penses. Ohapco rurchase Guide No. 11 free to in- 

 structors and officials. Matchourpriceswithothers. 

 Mention yoursohool when writinef or the book. (7) 



Chicago Apparatus Co. 66 s. ciinton Si Chicago 



