Mineralogy and Geology. 273 
Thus, at the point to which the lower thermometer can penetrate, 
the water does not attain the temperature of ebullition which it should 
have under the pressure to which it is subjected ; but it approaches that 
Let us in fact suppose that the column of water in the central basin 
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arked. 
1. On the Fossil Botany and Geology of the Rocks associated with 
the Coal of Australia ; by Frevericx M’Coy. With 9 plates. (Ann. 
Mag. Nat. Hist., vol. xx, pp. 145, 226, 298.)—We cannot in this 
Place better present the results of Mr. M’Coy’s very valuable investiga- 
Hons, than in his own concluding remarks. 
“ Having far exceeded the limits I had originally intended for the pre- 
Spiling part of this paper, I find it only possible to give a brief outline 
general topics on which I intended to have dwelt. First, as 
