!V 



sri EN CE.- ADVERTISEMENTS. 



JDLIEN'S IMPROVED LAPIDARY LATHES 



For SLICING nnd POLISHING rocks, 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. 



GUSTAVUS D. JULIEN, 932 Bloomfield St.. HOBOKEN. N. J. 



Ninth Revised Edition. Published Jan. 1901,. 



The Microscope and M cnoscopical Methods 



By SIMON HENRY QAQE, of Cornell University. 



Important changes have been made and the chapter on 

 Projection Microscope rewritten and more fully illustrated. 

 New figures of American microscopes and apparatus. 

 Postpaid 81.50 as for the 8th edition. 



C )MSTOCK PUBLISHING CO., Ithaca, N. Y. 



MARINE BIOLOGICAL LABORATORY 



Supply Department— 1 Zoology — Preserved Material 



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

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

 worts and Mosses For price lists ind all information ad- 

 dress GEO M.GRAY Dnrator Woods Holl. Mass 



The Rochlitz Automatic 

 WATER STILL 



works Jay and night without at- 

 tention, and gives absolutely pure 

 and sterile distilled water at the 

 rate of half a gallon per hour. It is 

 especially adapted to hospital and 

 home use. Illustra'ed descriptive 

 circular sent post free. 



THE SCIENTIFIC SHOP, 

 322 Dearborn Street, Chicago. 



Novel 



ROBERT HERRICK'S 

 THE COMMON LOT 



is 7107 V in its EigJifJi Edition 



MAX KOHL, 



CHEMNITZ, SAXONY. 



MANUFACTURER OF 



Precision Mechanical Instruments 



Largest Establishment of its Kind. 



Furnishes as a specialty complete outfits for 

 Physical and Chemical Laboratories ; Physical 

 Apparatus and Instruments ; Apparatus after 

 Tesla, Hertz, Marconi, etc. Complete outfits for 

 X-Ray work. Purest radium bromid of 1,200,- 

 000 X activity. 



INDUCTION COILS, with Changeable Self- 

 induction, which allow soft, medium hard 

 or hard X-Ray Tubes to be worked with 

 an electrolytic Interrupter with any current 



Profusely Illustrated catalogue with S,500 Illus- 

 trations, directions, quotations, references, etc., 

 in German, En</lish or French furnished 

 without any charge. 

 World's Fair, Chicago, 1893: 2 Diplomas; 

 World's Fair, Paris, 1900: Gold Medal. Rep- 

 resented at the World's Exposition, St. Louis. 

 Selling agents, 



EIMER & AMEND 



205-211 Third Ave., 



New Yorl< City. 



DUCKWORTH. 



Morphology and Anthropology. A Hand- 

 book for Students. By W. L H. Ui'ckwobth, 

 M.A., Fellow of Jesus C liege, Cambridge; 

 University Lecturer in Physical Anthropol- 

 ogy ; Correspondant Etranger de la Soci^te 

 d' Anthropologic de Paris. §4.50. net. 



Studies from the Anthropological Lab- 

 oratory, The Anatomy School Cambridge. 



By W. L. H. Duckworth, M.A. ii:!.()0, net. 



THE MACMILLAN COMPANY 



Publishers, 66 Fifth Ave., - NEW YORK 



The Apochromatic Objectives of Garl Zeiss, Jena 



FOCUS N. A. PRICE 



16 mm 30 dry 80. Marks 



8 " 65 " 100. 



4 " 96 " 140. 



2 " 1.30 homo, imm 300. 



2 " 1.40 " " .... 400. 



1.5 " 1.30 " " .... 350. 



Duty Free rate, F.O.B., Phila., 26J cents per Mark, less 5 per cent, for cash in 10 days. Orders 

 cabled without extra charge. 



ARTHUR H. THOMAS COMPAINV 



Importers and Dealers 



Microscopes and Laboratory Apparatus 



I2th and Walnut Sts., PHILADELPHIA 



