FIG. 1. SHOWING THE ENTIRE APPARA- 

 TUS. At the left is the arc lamp with con- 

 denser, the whole on an adjustable support. At 

 the right the microscope on its base plate and 

 the camera. At the right of the camera the 

 vertical focussing rod. The whole apparatus 

 stands on a platform, supported from the brick 

 wall. 



PIG. 2. SHOWS DETAILS OF THE BASE- 

 PLATE AND OF THE FOCUSSING DEVICE. 

 On the stage of the microscope is a brass pan 



"which contains the specimen immersed in fluid. 

 The reflector and support for hair are also seen 

 on the stage. Two Hook's joints (not shown In 

 the figure) are interposed in the horizontal rod 

 which connects the bevel gear with the right- 

 hand pulley-wheels. 



