ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



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upon a smaller area. Fig. 102 shows diagramniatically the path of epi- 

 scopically projected rays, and fig. 106 shows the optical bench as seen 

 from the front when thrown out of action. 



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Fig. 106. 



4. Lateral Episcopic Projection. — This mode of projection is princi- 

 pally resorted to in the case of those objects which must be maintained 

 in a vertical position in a fluid medium, or which, owing to their size, 

 cannot be accommodated upon the stage. If, for instance, it is required 



HC 



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Fig. 107. 



to project on the screen part of a living being, the subject is so placed 

 at the side of the apparatus that the part in question may be illuminated 

 by the lamp and completely reflected by the mirror. In this case the 

 lamp is returned to its horizontal position and turned through 45° about 



