ZOOLOGY AND BOTANY, MICEOSCOPY, ETC. 



807 



a large opening, and provided with reversible spring clips so as to 

 attach an object to the under side if required. To the stage can 

 be adapted either a circular stage-plate of thin sheet brass revolv- 

 ing concentrically, or the glass stage-plate shown in the figure, 

 with brass object-carrier, and allowing 1 inch of movement in all 

 directions. 



The mirror and substage slide upon a swinging tail-piece, the 

 latter being attached to a graduated circle, and allowing wide 

 range of motion above and below the stage. 



The body draws out to the standard length (10 inches), and takes 

 full size eye-pieces. It has an adapter for the broad-gauge screw. 

 When fully extended it is 15 inches in height, or can be reduced to 

 11 inches. 



Cosson's "Dissecting" and "Observing" Microscope. — This 

 (Fig. 167) can be used either as a simple or compound Microscope. 

 It consists of a stage, 13 cm. wide, supported on three pillars. In 



Fig. 167. 



liAOT. 



one of the two anterior pillars is a vertical support (raised or depressed 

 by rack and pinion), carrying a sliding arm for the doublets, &c. The 

 other pillar supports the elbow-piece to which the compound body is 

 fixed. The vertical part of the elbow-piece consists of two tubes 

 forming the ordinary Continental fine adjustment, and the whole can 



