Introduction. 15 



any microscopist who uses his instrument thoughtfully how 

 the love for the work will grow upon him, and how gradu- 

 ally he will become master of some special line which he 

 has adopted as his own. On this point we would echo the 

 words of a well-known microscopist : ' It needs no mar- 

 vellous intellect, no special brilliancy, to succeed in a 

 scientific study ; work at it ardently and perseveringly, and 

 success will follow.' 



We will now proceed to consider the microscope itself, 

 apart from its optical relations, which will follow in another 

 chapter. 



