ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



245 



the source of light in a metallic box fitted with a double condenser ; a 

 support .for the separation and projection objective ; and a reflecting- 



6 



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mirror fixed by a post to a sliding drawing board. The whole is 

 mounted on a wooden base 1*3 by 0'5 m. The position of the 



