PREFACE TO THIRD EDITION. 



THE success of this little work has greatly 

 exceeded the Author's most sanguine expectation 

 upwards of 10,000 copies having been already 

 sold. A new edition being now required, he 

 gladly avails himself of this opportunity to make 

 several important additions, consisting of fresh 

 matter interspersed with woodcuts, descriptive 

 of the Compound Microscope and its various 

 appendages, and an additional chapter on the 

 Structure and Uses of the Polariscope, by Mr. 

 F. Kitton. 



The Publishers hope that it may, in its present 

 shape, meet with the same favourable reception, 

 and prove a still more useful and reliable guide 

 to the Amateur Microscopist. 



