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 asa lens. ‘These 
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 
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