ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
419 
The condenser (fig. 50) is movable on two rectangular axes, which 
allow of its adjustment in all directions in a horizontal plane. For this 
purpose it is fixed on a small sliding carrier, and a screw B' regulates 
the adjustment in the transversal direction. For the adjustment^ the 
2 g 2 
