A 

 TEXT-BOOK 



OF 



THE MICEOSCOPE. 



CHAPTER I. 



THE MICROSCOPE. 



THE microscope (from pi/epos, little, and cr/conea), to 

 see), so called because it enables us to see objects 

 which are too small to be seen with the naked eye, 

 consists of several parts, each of which has its special 

 use. As the proper management of these is of great 

 importance in the successful application of the in- 

 strument to minute investigations, we shall com- 

 mence with the consideration of their names and 

 uses, including those of the more important pieces of 

 accessory apparatus. 



Microscope. The foot of the microscope is that 

 part which supports the instrument upon the table ; 

 it is connected above with the stand, of which it is 

 often considered a part. The stand sometimes con- 

 sists of a single rod or pillar ; but in the best micro- 

 scopes it is composed of two upright plates, between 

 which, at the upper part, the rest of the microscope 

 swings stiffly upon an axle. Arising from this axle, 

 indirectly through the medium of parts which require 

 no special mention, is an arm, to which the body is 



