THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



Vol. XI. JUNE, 1890. No. G. 



All coiniminicatio7is for this Jotirnal, whether relating to business or to cditoria.l 

 matters, and all books, fiatiiplilcts, exchanges, etc., slum Id be addressed to Ameri- 

 can Monthly Microscopical Journal, Box 6jo, Washington, D. C. 



European subscriptions may be sent directly to the above address accompanied 

 bv International Postal Order for $i.ij per annum, or they may be setit to Messrs. 

 Triibner &= Co., jj Ludgatc Hill, London, or to Mr. VV. P. Collins, i^j Great 

 Portland street, Londo7i, accompanied by the yearly price of five shillings. 



(iriffith CInl) Microscope. 



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



FAIRPORT, 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 witli society screw, a superior rack and pin- 

 ion and a delicate micrometer adjustment, allowing the greatest range 

 of ol)jcctives ; 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. 



Among the original 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 

 valualile slides ; the clips wiiich may be turned simultaneously upward 

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



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

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

 objectives. 



The strongest endorsement that can l)e given the microscope is the 

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

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

 croscopical Society, and b\- other expert microscopists. 



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



EXPLANATION OF PLATE. 



Fig. I. — IJ.Tusch aiul Lonil)'s Microtome. FlG. 2. — GriflUh Club Microscope. 



Copyright, 1890, by C. W. Smiley. 



