268 
INTERNAL STRUCTURE AND 
ciers, as first presented by Dr. Tyndall in bis 
admirable work, show that fragments of ice with 
moist surfaces arc readily reunited under press- 
ure into a solid mass. It follows from these ex- 
periments, that glacier-ice, at a temperature of 
32° Fahrenheit, may change its form and pre- 
serve its continuity during its motion, in virtue 
of the pressure to which it is subjected. The 
statement is, that, when two pieces of ice with 
moistened surfaces are placed in contact, they 
become cemented together by the freezing of a 
film of water between them, while, when the ice is 
below 32° Fahrenheit, and therefore dry , no effect 
of the kind can be produced. The freezing was 
also found to take place under water ; and the 
result was the same, even when the water into 
which the ice was plunged was a ; hot as the 
hand can bear. 
The fact that ice becomes cemented under 
these circumstances is fully established, and my 
own experiments have confirmed it to the fullest 
extent. I question, however, the statement, that 
regelation takes place by the freezing of a film of 
water between the fragments. I never have been 
able to detect any indication of the presence of 
such a film, and am, therefore, inclined to con- 
sider this result as akin to what takes place when 
fragments of moist clay or marl are pressed to- 
gether and thus reunited. When examining beds 
