ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 

 Fig. lOJr. 



517 



Microscopes with Bent Body-tube 

 tliat a vei'tical position of the 

 Microscope is a very incon- 

 venient one for the observer, 

 and that an inclined position 

 is in every way preferable. 

 The late Mr. C. Stodder illus- 

 trated this by the drawing 

 reproduced in fig. 104. 



On the other hand, there- 

 is no doubt that in a large 

 proportion of laboratory re- 

 searches the conditions of 

 observation with objects in 

 fluid necessitate the stage 

 being maintained in a hori- 

 zontal position. The two con- 

 ditions, however, of an oblique 

 body-tube with a horizontal 

 stage can well be reconciled 

 by the plan originally sug- 

 gested by M. Nachet, of in- 

 serting a truncated equilateral 

 prism in the body-tube, as 

 shown in fig. 105. The upper 

 part of the tube above the 

 prism being inclined, the 

 observer is relieved from the 

 discomfort which long obser- 



It is generally admitted 



