28 HOW TO USE THE MICROSCOPE 



Greater extension of the tube will give higher 

 magnifications, but not better definition. Thus, 

 with the same eye-piece, a larger image may be 

 obtataed by mcreasing the tube-length. 



These figures give the reader a rough idea of 

 magnifications which are obtamed in a similar com- 

 bination of objectives and eye-piece by other 

 makers ; but when accurate measurements are 

 desired, they must be obtained by use of a microm- 

 eter scale, described on p. 43. 



Furnished with a good stand, an eye-piece, and 

 an objective, the beginner is equipped for work. 

 The range of observation is increased by additional 

 objectives and oculars, and there are other acces- 

 sories, some of wliich are yet to be mentioned, which 

 are valuable additions to the microscopist's equip- 

 ment. 



