ZOOLOGY AND BOTANY, MICBOSCOPY, ETC, 
539 
band hang free. One of the rollers has a projecting pivot with a milled 
head by means of which it may be rotated, and the two rollers are con- 
nected by a narrow belt at each end. As the rollers are made to revolve 
Fig. 133. 
the band carrying the slides passes horizontally under the Microscope, 
resting meanwhile upon the two narrow belts, and being^kept at a definite 
distance from the objective of the Microscope by two guides, which press 
upon the slides from above. The brass frame rests upon a grooved bed- 
