1895.] 



MICROSCOPICAL JOURNAL. 



395 



an aperture, E E, and meets a concave mirror C, which is mov- 

 able and capable of being raised and lowered in order to send 

 the light through the lenses of the objective B. A prism, R, is 

 interposed in the path of the pencil in order to right it and 

 render it parallel with the axis of the microscope before it en- 

 ters the objective. 



The mirror C, and the prism R, are provided with an aperture 

 to permit of the passage of a conical tube, G, that allows one to 



perceive, through the ocular, the image of the preparation, T, 

 given by the objective B, so that such image is never met by 

 the luminous pencil. 



This process permits of obtaining a vertical illumination of 

 great intensity, and of perfect clearness, both qualities indispen- 

 sable for photographing microscopic images. 



