JOURNAL OF THE 



[January, 



' In Fig. 2 we see a small lamp (e) and a larger lamp {a) at 

 tached to an upright microscope. The foot (S) of the instru- 

 ment is screwed to a wooden box {CD). For facile movement 

 in every direction, both lamps are supported by arms furnished 

 with ball-and-socket joints. 



2. 



' The wires from the battery are fastened to the instrument 

 by the binding-screws p and n. From the screw at n a concealed 

 wire goes direct to the foot {S) of the stand, and beyond this 

 point the microscope itself serves as a conductor communicating 

 with the lamps a and e. The return wires are well insulated. 

 That from the lamp a runs along the jointed arm b, then down 

 the back of the stand and along the side of the stage to the sup- 

 port c, and thence into the box through the aperture r. That 



