SIMPLE MICROSCOPES. 



Purpose of the Microscope. The Microscope 

 is an instrument which magnifies objects, so that we 

 are better able to examine their structure than is pos- 

 sible with unassisted vision. 



Kinds of Microscopes. Microscopes may be 

 divided into two classes simple and compound the 

 difference between the two being that with the former 

 the object is viewed directly, while with the latter a 

 magnified image is observed ; while the first shows 

 the objects in their true position, the latter shows 

 them reversed, so that what is right in the object is 

 left in the image, and when an object appears to be 

 moving in a certain direction, the movement is in 

 reality the reverse, and must be moved accordingly 

 to keep it in view. 



Fig. i. 



Magnifiers. Simple microscopes are usually 

 termed magnifiers, and, when consisting of one or 

 more lenses, always remain simple. The most com- 



