208 G. W. Hawes—Inquid Carbon diowide in Smoky Quartz. 
within a fluid acted upon simply by the pressure of its ow? 
vapor, one can imagine the difficulty of restraining action, for 
physicists know what great precaution is necessary to obtain 
ties were ~ 
all possessed different rapidity of motion. After standing ove 
* Minéralogie Micrographique Roches Eruptives Francaises, Paris. 1879. 
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