204 G. W. Hawes—Ligquid Carbon diowide in Smoky Quartz. 
The smoky quartz from Branchville, Conn.,* is, however, the 
most wonderful in the number, size and diversity of the in- 
ie iron oxide, and some appear to be black coaly particles. 
ig. 1 represents a cavity in which the outer zone is water, 
the middle liquid carbon dioxide, and the inner gaseous pre 
bon dioxide. When such a cavity is gently warmed, the 
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_ Hig. 2 represents a cavity of the same nature save that - 
inner zone is relatively larger. When warmed, the ex panslo 
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The disappearance and reappearance of the inner bubble ann 6oM 
Ing are, in the large cavities, attended with violent ebullition. 
inner zone, causing the bubble to disappear at a temperature 
below the critical point of the CO,,. ; ffi- 
Figs. 5 and 6 represent cavities in which there is not rd 
cient liquid carbon dioxide to wet the walls between it and the 
* The quartz that contains these inclusions is, however, not all smoky. 
+ Sp. gr. of pure quartz 2°65. Smoky quartz of Forster (1. ¢.) Tene 
