500 



SUMMABY OF CUKEENT RESEARCHES RELATING TO 



to the inside of the box. The bracket, lamp, and sliding piece can be 

 raised or lowered according as it is desired to illuminate opaque or 

 transparent objects. A bull's-eye is attached to the bracket. 



Fig. 85. 



Projection Microscopes. — The exhibition of Messrs. Watson's 

 Microscope {ante, Vol. V. p. 1064) has brought forward a somewhat 

 large number of similar instruments, from which we select the 

 following : — 



Chevalier's Projection Microscope. — M. V. Chevalier designed the 

 instrument shown in fig. 86 for the purpose of showing microscopic 

 objects to a limited number of students. 



The wooden box (which can be inclined on a hinge-joint and 

 clamped) incloses a large right-angled prism by which the image from 

 the objective is reflected upwards to a ground-glass plate (2^ in. square) 



