ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
237 
along a parallel of latitude, l)y pushing the slide with your finger. To 
really appreciate the value of a sliding bar, after having used one for 
some time, go back to a Microscope without one, say a spring clip stage. 
Fig. 15. 
This instrument has a stage with a sliding bar, only more so. The main 
stage is made of 1/4 in. brass plate, and is of ample strength. The 
whole stage measures 5J in. wide by 4 in. deep, and the workmanship 
is excellent, but of that you can judge for yourselves as it is passed 
round. 
There is one point with regard to the draw-tube, and that is the way 
