iv 



SCIENCE.-ADVERTISEMENTS. 



JULIEN'S IMPROVED LAPIDARY LATHES 



For SLICING and POLISHING rooks, minerals, fossils, 

 etc., and for GRINDING DOWN the same into micro- 

 scopical thin sections. Lathes, fitted to foot or power, con- 

 tain COMPLETE APPARATUS for the work. Send tor 

 illustrated catalogue. Rock sections for sale. 



6USTAVUS D. JULIEN, 932 Bloomflelrt St . HOBOKEN, N. J. 



MARINE BIOLOGICAL LABORATORY 



Supply Uepartiueut — 1. Zoology — Preserved Material 

 of all types of animals for class work or for the museum. 

 2. Botany — Preserved Material of Algae, Fungi, Liver- 

 worts and Mosses. For price lists and all information ad- 

 dress GEO. M. GRAY. Curator Woods Holl, Mass. 



Ninth Revised Edition. Published Jan. 190U. 



The Microscope and Microscopical Methods 



By SIMON HENRY QAQE, of Cornell University. 



Important changes have been made and the chapter on 

 Pro.jection Microscope rewritten and more fully illustrated. 

 New figures of American microscopes and apparatus. 

 Postpaid 81. .50 as for the 8th edition 



COMSTOCK PUBLISHING CO,, Ithaca, N. Y. 



FOR SALE CHEAP 



P.eportsof U. S. Coast Survev, ls4'J-lfi04, complete, fi2 Vols. $2.5.00 

 .Sniitbsouiau Reports, 1853-1894. 42 Vols. - - - 13.00 

 Proceedings of Am. Assoc. Adv. Sci. complete,.5.S Vols.,paper 1.5.00 

 .Seieuce, 2d Series, Vols. I-VIII, l.Ssii-l.iSG, Bound - 4.00 

 Science, New .Series, complete to date, Vols. I-XIV, Bound : 



XV-XX, Unbound '- 10.00 



Delivered F. 0. B. at Princeton, N. J. 



Address Prof. C. A. YOUNG, Princeton, N. J. 



THE SCHOOL OF HEDICINE 

 AND DENTAL DEPARTMENT 



OF 



GEORGETOWN UNIVERSITY, 



in the City of Washington. 



students are required to devote their entire time to the 

 study of medicine. Evening classes have been abolished. t>s 

 it was found impracticable to properly train men engaged 

 in other pursuits during the day. The fifty-fifth Session 

 will begin September 29, 190^, and continue for eight 

 months. 



A large corps of teachers in proportion to the number 

 of students makes instruction more directly personal and 

 adapted to the special needs of the individual. The clinical 

 facilities of the University Hospital and other C'ty and 

 government hospitalsare ample, and the laboratories are all 

 well equipped. 



Special attention is ir.vited to the educational advan- 

 tages of tfrf Nf-liunal Capital, with its unrivalled libraries, 

 the Aiiuy Medical Museum, the Museum of Hygiene, and the 

 various scientific laboratories which are open to students. 



A circular of information giving full details of requisites 

 for admission, etc., will be sent on application lo 



GEORGE M. KOBER, Dean, 

 1600 T Street, N. W., Washington, D. C. 



o4 good book for every one luho owns or uses a horse is by 



Prof. I. P. ROBERTS, of CorneU 



Cloth, $1.25 rtet 

 (postage !ic.) 



THE HORSE 



THE MACMILLAN COMPANY, Pufafisliers 



DUTY FREE 

 IMPORTA TION 



We import scientific instruments free of duty for col- 

 leges and uni'versities from Societe Gene-voise, Cam- 

 bridge Scientific Instrument Co., Max Kohl, Carl Zeiss 

 Optical Works, Dr. M. Th. Edelmann, Otto Wolff 

 Hartmann & Braun, Siemens & Halske, and many other sources. 



We shall endea'vor to secure your business on the basis of moderate prices and to 

 keep it on the score of good service. An inquiry "will receive a prompt reply. 



THE SCIENTIFIC SHOP albert b. porter 

 SCIENTIFIC INSTRUMENTS 322 Dearborn Street, CHICAGO 



Leuckart=Chun Zoological Charts 



of 



Invertebrates and Chun Charts of Vertebrates 



Price, mounted on linen, Duty Free, $1.75 each German Pamphlet on request 



ARTHUR H. THOMAS COMPANY, importers and Dealers 

 Microscopes and Laboratory Apparatus 12th and Walnut Sts., Philadelphia 



