THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



Vol. XI. JUNE, 1890. No. 6. 



A/l commutiications for this Journal, whether relating to business or to editorial 

 matters, and all books, pamphlets, exchanges, etc., should be addressed to Amej'i- 

 can Monthly Mic7'oscopical Jourjial, Box 6jo, Washingtoft, D. C. 



European subsc?'iptiojis may be scjii directly to the above address accompanied 

 by International Postal Order for $1.1 j per a7inum, or they inay be sent to Messrs. 

 Triibner &-> Co., S7 Ludgate Hill, Londofi, or to Mr. W. P. Collins, i^y G?^eat 

 Portland street, London, accompanied by the yearly p7'ice of five shillings. 



Griffith Club Microscope. 



By E. H. GRIFFITH, F. R. M. S., 



FAIKrORT, N. Y. 



/ 



[with one plate.] 



This is a full-sized, first-class monocular, made of brass, steady when 

 in position, free from tremor, unique in design, and beautiful in appear- 

 ance. It has a draw-tube with society screw, a superior rack and pin- 

 ion and a delicate micrometer adjustment, allowing the greatest range 

 of objectives ; substage ring and revolving diaphragm, graduated ad- 

 justable mirror-bar that may be set at any angle above or below the 

 stage, giving any obliquity of illumination ; plane and concave mirrors, 

 glass-faced thin stage with the clips supported above it on a bar, allow- 

 ing the use of the entire surface. 



Amoni^' the ori«-iiial features are the turn-table base, making: one of 

 the best turn-tables in use ; the adjustable lamp for class and exhibition 

 purposes ; the micrometer adjustment, giving a range of nearly three 

 inches and which locks the rack when in use, making a safeguard for 

 valuable slides ; the clips which may be turned simultaneously upward 

 on an axis out of the way, and its portability. 



The microscope is provided with a Morocco-covered, velvet-lined 

 case, with the turn-table spindle ready for use, and with receptacles for 

 objectives. 



The strongest endorsement that can be given the microscope is the 

 fact that it is owned by a large percentage of the ofHcers and members 

 of the American Society of Microscopists, members of the Royal Mi- 

 croscopical Society, and by other expert microscopists. 



The stand is furnished with | inch and \ inch objectives. 



EXPLANATION OF PLATE. 



Fig. I. — liaiisch and Lonil)'s Microtome. F'ig. 2. — Griffith Club Microscope. 



Copyright, 1890, by C. W. Smiley. 



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