Bausch & Lomb BH Microscope 



T 



'HE aim has been to produce 

 an instrument of optical excel- 

 lence and mechanical perfec- 

 tion at a low price, and while 

 meeting this requirement, this in- 

 strument is built on the same gen- 

 eral lines as our higher priced 

 microscopes. 



It is simple and staunch in con- 

 struction, and the parts are all 

 practically dust proof. It is pro- 

 vided with our new handle-arm, 

 which permits its being readily 

 carried without injury to the fine 

 adjustment. The objectives are 

 of the highest quality. 



Complete with 1 6mm. and 4mm. 

 objectives, 25mm. eye-piece, 

 $29. 50. With double nose-piece, 

 $33.50. 



Catalog on request. Send for Booklet of Ganong Botanical Ap- 

 paratus. It will interest every teacher of botany. 



DDIC1V/I ISA LITTLE MAGAZINE OF LENS 

 rrvlOlVl INFORMATION. SEND FOR COPY 



•JOCK 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 



Cail Zeiss, Jena 

 Offices: 

 New York 

 Boston 



Chicago 



George N. Saegmuller 

 San Francisco 

 Washington 

 London 

 Frankfort 



ROCHESTER, N. Y. 



WATSON & SONS' [RAW 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 he found 

 necessary or con- 

 venient. 



It has Watson's 

 diagonal rack-work 

 coarse adjustment 

 and perfected lever 

 fine 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 c 4 



With § and £ Objectives, 1 ocular and case ' 6 

 With § 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 37/6 np 

 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 — micro- 

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

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

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

 orders should be sent. 



15 



8 6 



accessories 



Refracting and Reflecting 



Astronomical Telescopes 



Standard and Portable 



Visual and Photographic 



OBJECTIVES 



Computed by our associate 



DR. F. R. riOULTON 



(Chicago University) 



OBSERVATOR IBS 



Specula, Planes, Eyepieces, etc. 



Illustration shows 5-in. with pneumatic clock. 



Photographs and Circulars on request 

 LOHHANN BROS. 



QREENVILLE, OHIO : : : : U. S. A. 



