8 The Microscope. 



screen placed at a considerable distance. These in- 

 struments cannot be said really to magnify as much 

 as the compound microscope. The farther the screen 

 is removed, the larger will be the image, but it will be 

 at the expense of its light and clearness; this sort 



No. 2. Binocular Microscope. 



of instrument is not intended for the purposes of in- 

 vestigation, but rather as an amusing and instructive 

 exhibition. 



The oxy-hydrogen microscope, though cumbrous 



