ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 



105 



Fig. 28 shows the arrangement for microscopic projection. It will 

 be "observed that the lens L and Microscope M can remain in situ while 

 the apparatus is used for episcopic or diascopic work. The exit-pupil of 

 the lamp reflector is not a complete circle but a circular ring. This 



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inconvenience is obviated in a simple manner. The ^Microscope axis is 

 made to coincide with the axis of the lamp reflector, and by using a 

 coaxial condensing lens L of large dimensions, so placed that it focuses 

 upon the condenser of the Microscope, solid illumination is obtained. 



