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SUMMARY OF CUKRENT RESEARCHES RELATING TO 



MICEOSCOPY. 

 a. Instruments, Accessories, &c.* 



Fol's Travelling and Dissecting Microscope. — Prof. H. Fol's 



Travelling Microscope is shown in fig. 45. 



As will be seen, the upper portion is similar to the large Micro- 

 scope of the Geneva Society (cf. Vol. IV. 1884, p. 281), while the 

 folding base is made on the ingenious plan of the Travelling 

 Microscope of the same manufacturers (cf. tom. cit., p. 437). 



The new points (in addition to the special stability and size of 

 the stage, unusual in "Travelling" Microscopes) are : (1) the stage and 



Fig. 45. 



Fig. 46. 



substage, both of which are movable on a single rack, and (2) the 

 incandescent electric lamp of four candle power attached to the 

 front of the cross arm, and worked by a bichromate battery of four 

 elements.. The lamp can also be attached beneath the stage when 

 desired. 



Another point is (3) that the instrument can be converted 



* This subdivision is arranged in the following order :— (1) Stands ; (2) Eye- 

 pieces and Objectives; (3) Illuminating Apparatus; (4) Other Accessories; 

 (5) Photo-micrography; (6) Manipulation; (7) Microscopical Optics, Books, 

 and Miscellaneous matters. 



