274 Scientific Intelligence. 
cier descends merely by its weight, at the rate observed by Pro- 
fessor Tyndall. From experiments which he has made, he finds 
But although it is thus demonstrated that glaciers cannot de- 
scend by means of their weight alone in the manner generally 
supposed, still, I venture to think that, notwithstanding the de- 
monstration, gravitation after all may be the only force moving 
e ice. 
_ The correctness of the above conclusion, that the weight of the 
ice 1s not a sufficient cause, depends upon the truth of a certain 
- This is so obvi to requir further elucidation. 
The whole matter, therefore, resolves itself into this one question, 
as to whether or not th aring-force of a crystalline molecule 
: : 
, but in d ick 8 
_ if we analyze the process by which heat is conducted throug 
1¢e, we shall find that we have reason to believe that while 
