IV 



SCIENCE.- ADVERTISEMENTS. 



MICROSCOPES 



New Stiulents' Conipoiind jMicrdscopcs, with 



full outfit ioi- preparing specimens .'^(J.tK) 



New Small Laboratory Microscopes, with 

 full outfit for preparing speoinieus 9.00 



New Larce Laboratory Jlicroscope, with 

 full outfit for preparing specimens 18.00 



Full instructions for using the microscope 

 and niountiug and preparing specimens with 

 eacn outfit. 



WILLIAMS, BROWK & EARLE, 



Dept. M, 918 Chestnut St., Pblladelplila, Pa. 



MARINE BIOLOGICAL LABORATORY 



Supply Department — 1. Zoology — Preserved Materia' 



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

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

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

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



THE BRAIN OF THE SHEEP, by Burt G. 

 Wilder. Third edition, revised, 1903. Explicit Direc- 

 tions for Removing, Preserving, and Dissecting the 

 Sheep Brain. Royal Octavo, 30 pages, 8 plates, and 

 three figures in the te.xt. Part IV of " Physiology Prac- 

 ticums", third edition. Price, postpaid, fifty cents. 

 Address 



HENRY COWELL, McGraw Hall, Cornell University, 

 ITHACA. NEW VORK. 



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, »s 

 it was tound impracticable to properly train men engaged 

 m ottier pursuits during the day. The fifty-fifth St-ssion 

 will begin September 29, 190-1, 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 city and 

 government hospitals are ample, and the laboratories are all 

 well equipped. 



Special attention is invited to the educational advan- 

 tages of thf Nj-lional Capital, with its unrivailed libraries, 

 the Aituy Medical Museum, the Museum of Hygiene, and the 

 various scientific laboratories wtjich are open to students. 



A circular of information giving full details of requisites 

 for admi-ssion, etc., will be sent on application to 



GEORGE M. KOBER, Dean, 

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



Getting Acquainted with the Trees 



By J. HORACE McFARLAND. 



Illustrated, Uoth, $1.50 net (postage 18c.) 



"Both delightful and companionable." 



— Times and Despatch. 



THE MACMILLAN COMPANY, Publishers 



Recently Imported Scientific Books 



RENDIiB, ALFRED BARTON, British 3Iuscum 



The Classification of Flowering Plants. Volume I. Gymnosperms and Monocotyledons. 



6 + 385 pp., 8vo, il., ci, $3.50, net. 



RUSSELL, ALEXANDER, Faraday House, London 



A Treatise on the Theory of Alternating Currents. Volume I. 



Cambridge Physical Series. 12 -f 507 pp., Bvo, el., $4.00 net. 



WALKER, JAMES, Oxford University 



The Analytical Theory of Light. 



16 + 416 pp., 8vo, cl., $5.00 net. 



WARD. H. MARSHALL, University of Cambridge 



Trees : A Handbook of Forest-Botany for the Woodlands and the Laboratory. Volume I. 



Buds and Twigs. With many illustrations. 14+ 271 pp., 12mo, il., cl., $1.50 net. 



Volume II. Leaves. With Illustrations. 



Cambridge Biological Series. 8 + 348 pp., 12mo, il., cl., $1.50 net. 



WEST, G. S., Royal Agricultural College, Cirencester 



A Treatise on the British Freshwater Algae. With many illustrations. 



15+ 872 pp., 8vo, il., cl., $3.50, net 



PuMuhcd in the jf^g MACMILLAN COMPANY 



United States by- 



New York 



