PREFACE TO FIRST EDITION. 



It may seem to some persons an act of presumption 

 for a mailer of microscopes and microscopical acces- 

 sories to enter the field of authorship and attempt to 

 supplement the valuable labors which in recent years 

 have made the use of the microscope an indispensible 

 aid in the advancement of science. 



To such, if any, I submit that, being a producer 

 of microscopes and their accessories, I have had 

 opportunity to become acquainted with the lack of 

 general knowledge of the fundamental principles of 

 the instrument and the best methods of technique, even 

 among owners of microscopes. Indeed, with so many 

 complications, with almost unlimited powers and uses 

 of the instrument, the beginner cannot fail to feel the 

 need of a guide and adviser. 



In order to accomplish the greatest good, I have 

 started out in this little Manual with the supposition 

 that the purchaser, or owner, is a beginner, and 

 absolutely ignorant of the microscope and everything 

 which pertains to it, and therefore have attempted to 

 convey, step by step, in as simple language as I could 

 command, information which will, I trust, lead to ease 

 of manipulation and give both pleasure and profit to 

 those for whom it was specially written. 



With these, its purposes and hopes, I beg for my 

 self-imposed labor a friendly reception. 



EDWARD BAUSCH. 



June i, 1885. 



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