Ch. X] 



SLIDES AND COVER-GLASSES 



313 



Thick slides are preferred by many to thin ones. For micro- 

 chemical work Dr. Chamot recommends slides of half the length of 



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those used in ordinary microscopic work. From the rapidity with 

 which they are destroyed, he thinks the ground edges are unneces- 

 sarily expensive. He adds further: "It is a great misfortune that the 



