F. W. Clarke on the Atomic Volumes of the Elements. 313 
The atomic volume of ordinary phosphorus is from 16-9 to 
17-0, and that of the amorphous red variety from 13:9 to 145. 
That of amorphous arsenic is 15°9. These numbers seem to 
i liquid compounds. 
assing now to the carbon group, we still find close multiple 
relations existing. The sp. gr. of the purest graphite is 220 
_ (Brodie) and hence its atomic volume is found to be 53. If 
obtained by Hautefeuille, has a sp. gt. © 1, and hence the 
atomic volume 31-2. If we also take into account the seeming 
equality between the atomic volumes of these elements in their 
liquid compounds, the conclusion concerning their values in 
Re For specific gravities of minerals quoted in this paper, see the last edition of 
Dana’s Mineralogy.” 
_ Am. Jour. Scr.—Seconp Series, VoL. XLVI, No. 141,—May, 1869. 
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