174 MICROSCOPIC OBJECTS. 



every requirement, as the microscopes of one maker in 

 some particulars surpass those of another, while again in 

 other parts they fall short. Under these circumstances 

 it has been deemed advisable to select two forms of 

 microscope lately constructed by Mr. Pritchard, who 

 having been the first to enter this field of inquiry, and to 

 give the public the fruits of his experience in these 

 matters, is entitled to precedence. 



Description of a new Vertical Achromatic Microscope. 

 — This instrument was constructed with a view to afford 

 to naturalists and to medical and scientific men in 

 general, as well as those persons who desire to view the 

 curious and the beautiful in the minutiae of Nature's 

 productions, a microscope at a moderate cost, and yet 

 one whose performance might be rehed upon. The 

 modern microscope, with all its trappings, is an expensive 

 affair, and requires some skiU and practice to bring out 

 aU its merits. Naturahsts and medical men have long 

 felt the want of a simple microscope that shall faithfully 

 depict the structure of bodies submitted to it, and which 

 shall at the same time be compact in form and small in 

 expense. These desiderata appear to be accomphshed in 

 the instrument represented in the opposite page, the 

 price of which, including three pair- of achromatic lenses 

 and case, is bl. \Qs, Its optical qualities are clear defi- 

 nition, moderate penetration, and a large field of view. 

 The mechanical advantages are great steadiness, a good 

 adjustment, together with the utmost simplicity and 

 portability consistent with fitness for general purposes. 



