HOW TO USE THE MICROSCOPE 



CHAPTER I 



THE SIMPLE MICROSCOPE 



Some time ago I handed a pocket lens to a working 

 man of average iateUigence, and induced him to 

 examine several common objects with its aid. He 

 was astounded and deHghted with what he was able 

 to see. He declared that he had never seen so many 

 wonderful and beautiful things in his Ufe ; and it 

 was not long before he bought a cheap lens for him- 

 self, which he now has in regular use. It may be 

 said that his lens has introduced him to a new 

 world, in that it provides a means for him to see 

 in beautiful detail many things which cannot be 

 so seen with the unaided eye. I was surprised to 

 learn that this man had never used a magnifying 

 glass until I lent him mine. I am so accustomed 

 to the use of my pocket lens that I found it difficult 

 to reahze what is undoubtedly true — that an enor- 

 mous number of civilized persons, who have re- 

 ceived some elements of education, are in the posi- 

 tion of my working-man friend ; they hardly know 

 the use of a simple magnifying glass, and the com- 

 pound microscope is entirely beyond their ken. 



Presumably a purchaser of this little book will not 

 be in the position indicated, and in writing I pro- 

 pose to assume a sHght knowledge of my subject 



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