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 microscope an indis- 

 pensible aid in the advancement of science. 



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

 microscopes and their accessories, I have had oppor- 

 tunity to become acquainted with the lack of general 

 knowledge of the fund imental principles of the 

 instrument and the best method 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 abso- 

 lutely 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. 



