438 EE. Hungerford—Observations on Snow and Ice 
A gla 
that fragments of ice may be fir ot re- eS ctned at all tem- 
tioned in the note of Feb. 3, “ the great ease with which the 
joint is separated when the pressure has been applied only a 
few minutes.” But, not content with this, the note of January 
10, 1871, institutes a test by weight and measure. In this in- 
ures less than a square inch, and the force necessary to 
pull the fragments apart exceeds thirty pounds. In my note-_ 
book comments on this t ; nd the conviction expressed 
obliterated. And I remember that this remark was occasioned 
by the close apie: of the joint, and the growing indistinct- 
ness of the line of fracture in certain cases, under pressure. 
T scarcely nau call especial attention to the violence required 
in some cases to part the reunited fragments or to the fact that 
the second break sometimes occurs along a new line of fracture 
as in the note of January 4th. In regard to the influence of 
time as a factor in the reunion of the broken sepia my impres- 
sions are strongly in favor of the value of time to the result. 
I ver known a prism which had ee "heck exposed to 
pressure for w minutes to show strong adherence. It is 
—freshly joined faces come apart readily with a light snap. 
The trial recorded under date of January 27th, 1869, gives us 
a prism, subjected to ressure for a few hours, which shows 
“evident signs of reuniting,” while one which has been kept in 
the clamps “some twenty-four hours was so firmly reunited 
that in Ageing tabs to part it I cioaah the ice would break else- 
where.” So far as the evidence goes ther me the element of 
time is an hisscanais one in the process; this conviction 
has grown egal! me during the Lee in are I have experi- 
mented upon snow and i 
As to the bank point n ued as being among the objects 
kept in view during these studies, it is difficult to conceive 
