Bausch & Lomb BH Microscope 



has been designed especially for use 

 in schools and colleges, and in it we 

 have aimed to produce a very rigid, 

 durable instrument, at a moderate 

 price. 



It is of the handle arm type 

 and hence possesses the great ad- 

 vantage of enabling it to be carried 

 without injury to the fine adjust- 

 ment, a point of much importance 

 in laboratory work where instru- 

 ments are continually handled by 

 students. 



The fine adjustment is unusu- 

 ally responsive. The working parts 

 are thoroughly protected from dust. 

 BH 2, with f and ^ objectives, 1 -in. 

 eye-piece, double nose-piece, 



$33.50 



BH 4, with f and ^ objectives, 2 -in. 



and 1-in. eye-pieces, double 



nose-piece, . . . $35.00 



Bausch & Lomb Optical Co. 



Carl Zeiss, Jena 



.B-t 



George N. Saegmuller 



ROCHESTER, N. Y. 



WATSON & SONS 1 



EDINBURGH 



Student's Microscope 



Model "H" 



The most popular 

 British made Mi- 

 croscope. 



It combines all 

 the requirements 

 that original re- 

 search, high-power 

 work and photo- 

 micrography call 

 for, including 

 coarse and fine ad- 

 justments of high- 

 ' est precision, me- 

 chanical move- 

 ments to stage and 

 compound Sub- 

 stage, with screws 

 to center and rack- 

 work to focus. 



Stand only, price £ 9 12 6 



With § and £ Objectives. 2 oculars, Abbe 

 Illuminator with Iris diaphragm, and 



Mahogany case 15 



Oil Immersion ^ " 1.20 N.A 4 00 



T V 130 N.A 5 



Illustrated 178-page catalogue of microscopes and accessories 

 mailed free on request; more than 20 models to select from at S7/6 up. 



WATSON & SONS Microscope Manufacturers, 



WHOLESALE AND RETAIL 



313 HIGH H0LB0RN, LONDON, ENGLAND 



Established 1837. Awarded 42 Gold and other Medals 



Microscopes may be imported free by 



Educational Institutions 



American Agents: The Scientific Shop (A. B. Porter) Rooms 1230- 

 1245 Monon Building, 324 Dearborn Street, Chicago, through whom 

 orders should be sent. 



For showing on the screen opaque objects, book 

 Illustrations, engravings, and lantern slides. 

 It is the most perfect instrument of its kind. 

 It has a detachable Book-Holder. 

 It concentrates all light on the object. 

 It shows printed matter correctly. 

 It is in use at 



Harvard, Cornell, U. of P., Leland 

 Stanford, Girard College and 

 hundreds of other institutions. 



Wifeless Telegraph Outfits 



For school room and experimental -work. Com- 

 plete sending and receiving stations. 



Lantern Slides — Microscopic Slides 



Illustrating Botany, Geology and other sciences. 

 Lists on application. 



WILLIAMS, BROWN & EARLE, 

 Dept. N, 918 Chestnut Street, Philadelphia, Pa. 



BEFORE DECIDING 



WHERE TO ATTEND SCHOOL 



StaiS'.. Valparaiso University, v fa™'r 



One of the Largest Universities and Training 

 Schools in the United States 



26 Departments 166 Instructors 



Excellent Equipments 



Expenses less than at any other school. Catalogue mailed 

 free. Address 



H. B. BROWN, President. 



or 0. P. KINSEY, Vice Pre*. 

 Our thirty-fifth year will open September 3, 1907. 



Fossils, Minerals, 



Shells, 

 Mounted Birds 

 and Mammals 



For the amateur or advanced collector. Tools and 

 eupplies for all kinds of Natural History work. 

 Illustrated catalogue free. 



A. W.JONES, 

 Box 377 Salina, Kansas 



