302 
THE GEOLOGIST. 
fresli demonstration for the sake of geological enquirers, such 
as many of the correspondents of The Geologist must neces- 
sarily be. 
I here propose to offer a note on some of the results of weathering 
on granite-rocks. My note-book of last year contains one or two 
sketches illustrating that subject, and reminding me of much that 
has been written by others about it. 
Lign. 2. — The CheesewTing, near Liskicrd, Cornwall. 
In graaitic regions we often find the surface of the countries dis- 
tinguished by peaks and crags ; irregularly prominent masses of 
rudely-heaped rock-fragments, forming " tors ;" more regularly piled 
isolated heaps or pillars, such as " cheesewrings ;" and sometimes a 
peak or pile surmounted by a single, moveable, and well-poised 
mass, constituting a rocking or logging stone. Figs. 1, 2, and 4, 
which illustrate these thi-ee forms that weathered granite-rock pre- 
sents, are copied from the plates illustrating Dr. M'Culloch's 
memoir on the granite-tors of Cornwall, in vol. ii. of the Trans- 
actions of the Geological Society, 1848. In this memoir much 
valuable information will be found ; and the difficulties of the sub- 
