THE SCHOOL MICRQSCOPE 



OUR BH MICROSCOPE is 

 especially designed for school 

 work. It is a simple, strong, highly 

 perfected instrument of our newest 

 handle-arm type which permits its 

 being easily carried without injury 

 to the fine adjustment, which is re- 

 sponsive yet strong. All the work- 

 ing parts are practically dust proof. 

 Complete with 16mm and 4mm 

 objectives, 25mm eye-piece, 

 $29.50. With double nosepiece, 

 $33.50. 



Send for Catalog and also for 

 Booklet of Ganong Botanical Ap- 

 paratus. 



IS A LITTLE MAGAZINE OF LENS 

 INFORMATION. SEND FOR COPY 



•J Our name on a field glass, photographic lens, mi- 

 croscope, LABORATORY APPARATUS, SCIENTIFIC OR ENGI- 

 NEERING INSTRUMENT IS A MARK OF QUALITY. 



Bausch & Lomb Optical Company 



PRISM 



Carl Zeiss, Jena 

 Offices: 

 New York 



George N. Saegmuller 

 San Francisco 

 Washington 

 Boston \ 1/ London 

 Chicago \1/ Frankfort 



ROCHESTER, N. Y. 



WATSON & SONS' FRAM MICROSCOPE 



This model is a 

 favorite one with 

 British students 

 and it is especially 

 advantageous be- 

 cause additions 

 may be made to it 

 as may be found 

 necessary or con- 

 venient. 



It has Watson's 

 diagonal rackwork 

 coarse adjustment 

 and perfected lever 

 fl n e adjustment. 

 The stage is covered 

 with rubber and it 

 carries an Abbe il- 

 luminator. A late 

 president of the 

 Royal Microscop- 

 ical Society said of 

 it : "A Microscope 

 that can for the 

 first time with truth 

 be called 'good 

 enough for Histo- 

 logical purposes.' " 



Stand only, price £ 4 



With § and J Objectives, 1 ocular and case 6 

 With i and J Objectives, 2 oculars, Abbe 

 Illuminator with Iris diaphragm, and 

 case 



Illustrated 178 page catalogue of microscopes and 

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

 Microscopes may be imported free by Educational Institutions. 



WATSON & SONS, Microscope Manufacturers, 



WHOLESALE AND RETAIL 



313 HIGH H0LB0RN. LONDON. ENGLAND 



Established 1837. Awarded 42 Gold and other medals — mioro- 

 •oopic Objects may be conveniently sent to the U.S.A. by parcel post. 

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

 1245 Monon Building, S24 Dearborn Street, Chicago, through whom 

 orders should be sent. 



16 



8 5 



accessories 



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., Iceland 

 Stanford, Girard College and 

 hundreds of other institutions. 



Wireless 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. 



QUALITY! QUALITY!! QUALITY!!! 



VANILLA CHOCOLATE 



(PINK WRAPPER) 



IS BY FAR THE BEST 



EATING & DRINKING CHOCOLATE IN THE WOULD. 



<e%^ COCOA 



FOR PURITY & FLAVOR 



CANNOT BE EQUALLED. 



PREMIUM (x> 



FAMILY COOKING a BAKING CHOCOLATE 



(BLUE "WRAPPER) 

 IS UNSURPASSE D FOR COOK ING & BAKING. 



ALL OUR COCOA & CHOCOLATE PRODUCTS ARE RICH IN THAT 

 DELICIOUS GENUINE CHOCOLATE FLAVOR 

 ON ACCOUNT OF QUALITY OF BEANS 

 USE D AND THEIR B LENDIN6. 



SOLD AT OUR STORES » BY GROCERS EVERYWHERE. 



