1893.] 



MICROSCOFIOAL JOUKNAL. 



175 



shaped holder in turn carries the oil reservoir, and attached to 

 this is the shade carrying the bull's-eye lens. This is a finely 

 ground and polished lens, which, being accurately focused upon 



The Acme Microscope Lamp. 



a flame of moderate size, gives a light sufficient for the highest 

 powers, with very little heat. 



For whitening this light there is a disc of blue-tinted glass, D, 

 which is held back of the bull's-eye lens by a small ring ; and for 

 softening the light, when used with low power, a ground glass, 



