PREFACE TO FIRST EDITION. 



It may seem to some persons an act of presump- 

 tion for a maker of microscopes and microscopic 

 accessories to enter the field of authorship and 

 attempt to supplement the valuable labors which 

 in recent years have made the use of the micro- 

 scope 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 method of technique, 

 even among owners of microscopes. Indeed, with 

 so many complications, with almost unlimited pow- 

 ers and uses of the instrument, the beginner can- 

 not 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 supposi- 

 tion 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. 



OF 



UNIVERSITY 



