380 
THE TERTIARY VOLCANOES 
BOOK VIII 
As it is convenient to adopt some general term to express the whole series 
of varieties, I have' used the word granophyre for this purpose. 
That the large area of these rocks in Skye was the result of many 
separate protrusions from distinct centres of emission may be inferred, I 
think, not only from the varieties of petrographical character in the material, 
but also from the peculiar topography of the ground, and perhaps from the 
curious relation which seems, in some instances at least, to be traceable 
between the external features and apparent internal structure of the hills. 
It will he seen from the Map (No. VI.) that in the area lying to the east 
of Strath More the granophyre is broken up into nearly detached portions 
by intervening patches of older rocks. There can be little doubt that the 
