Dr Daubeny on the Volcanoes of Auvergne. 
plain the occurrence of the latter rock as well as the former^ 
unaltered in the midst of domite. 
With regard to the volcanic traps or lavas which occupy the 
lower portions of the mountain, we may consider them con- 
nected with the rocks of the same description, which occur in 
the Montagne des Gouttes, and Puy Chaumont, contiguous, 
and that it was in these that the volcanic action to which we 
ascribe the elevation of the Puy Chopine principally resided. 
Thus, the expansive power existing in the lavas beneath, may 
have been the means of elevating the incumbent granite to the 
height at which we now find it on the summit of the Puy Cho- 
pine, producing that occasional alteration in its appearance, 
which has converted it into the rock we call Domite, and, in the 
instance alluded to by M. Montlosier, caused it to protrude 
them both. 
The geologist who adopts this view of the subject, will regard 
the modifications of appearance, observable in the rocks which 
have been referred to the general head of Domite, as arising 
from some difference, either in the intensity of the heat to which 
they were severally subjected, or to the mode of its application. 
Thus, as M. Montlosier has observed, the Puy de Monchar, 
a mountain to the N. W. of the Puy de Dome, on the road to 
Aurillac, seems merely to have been forced up, without having 
experienced any material alteration in structure, for though 
partly composed of scoria, and other volcanic products, yet it is 
also made up of masses of unaltered granite, unaccompanied, as 
at the Puy Chopine, with domite, but in such disorder, as plain- 
ly demonstrates that they do not exist in their natural position. 
The second stage of alteration, is seen in the case of the Puy 
Chopine, where the granite is not only raised by some expan- 
sive force, from the spot it originally occupied, but also partial- 
ly converted into the state of domite, whilst a portion still re- 
mains unchanged, to shew from what materials the former was 
produced. 
Lastly, in tlie case of the two Cliersous, the Grand Sarcouy, 
and the Puy de Dome, the change from granite into domite is 
complete throughout, and the whole is reduced into a spongy 
and pulverable mass, as is particularly seen in the Puy Sar- 
