BECK'S NEW HISTOLOGICAL DISSECTING MICROSCOPE. 79 



BECK'S NEW HISTOLOGICAL DISSECTING MICROSCOPE. 



This instrument combines a compound microscope 

 with a single and dissecting one in a very compact and 



practical form. The stout immovable arm carrying the 

 lens when used as a single microscope, is so arranged 

 that a compound body with eye-piece and draw lube may 

 be attached to its upper surface, whilst beneath it is 



