CHAPTER IV. 



THE MICROSCOPE. 



To the student of Nature the microscope is indispensable ; 

 he requires it to obtain an enlarged view of the objects he 

 studies. The simplest form of microscope is a piece of glass 

 with one or both sides convex, and known as a lens. These 



FIG. 30. 



simple lenses are very cheap and still very handy. It is some- 

 times desirable to have two or three so mounted that either 

 one or more may be used, as occasion demands a greater or 

 6 (81) 



