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 



si 



CO x 



10 

 CM 



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 



