Bausch & Lomb Optical Co. 



Carl Zeiss Optical Works, Jena George N. Saegmuller 



A booklet entitled "A Triple Alliance in Optics" is now in press. 

 It gives a detailed account of the association of interests of the three 

 above mentioned firms and is designed for general distribution. If 

 you do not receive a copy we shall be pleased to mail one on request. 



Microscopes 



For School 



and 



College Use 



Can be imported free of 

 duty at a saving of 

 from 35 to 40% from the 

 American prices. We 

 import microscopes for 

 the largest institutions 

 in the country. 



The New 

 Reflecting Lantern 



for showing on the screen opaque objects, 

 book illustrations, engravings and lantern 

 slides, is the most perfect instrument of its 

 kind. It is in use at Harvard, Cornell, 

 U. of P., Leland Stanford, Girard College 

 and 500 other institutions. 



Lantern Slides and Microscopic Slides 



illustrating Botany, Geology and other sciences. 



Lists on application. 



WILLIAMS. BROWN & EARLE. 

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



WATSON & SONS' 



MICROSCOPIC OBJECTS 



Every Microscopist, no matter in what depart-, 

 ment he may be interested, will find specimens 

 of interest and rarity listed in Watson's Cata- 

 logue of Microscopic Objects. It is a classified 

 list representing a stock of more than 



40,000 CHOICE SPECIMENS 



Each guaranteed typical of the structure it 

 represents. These slides are used for teaching 

 and examination purposes throughout the world, 

 The series comprise illustrations in Histology, 

 Pathology, Zoology, Bacteriology, Hematology 

 (including Malaria), Botany, Entomology, Geol- 

 ogy, Diatomacese, etc. , etc. Amateurs will find 

 in this list many desirable additions for their 

 cabinets, from Is. up. 



The above list will be mailed free on request. 



WATSON & SONS Microscope Manufacturers, 



WHOLESALE AND RETAIL 



313 HIGH HOLBORN, LONDON, ENGLAND 



Established 1837. Awarded 42 Gold and other Medals 



Microscopic Objects may be conveniently Sent 



to the U. S. A. by parcel post. 



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

 1245 Monon Building, 321 Dearborn Street, Chicago, through whom 

 orders should be sen 



QUALITY ~^"> 

 HIGHER THAN PRICE, \ 



PRICE WITHIN THE REACH 



OF ALL- I 



COCOA 



STANDS 



UNEQUALLED 



for PURITY AND 



DELICIOUSNESS 



OF FLAVOR. 



