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POPULAR SCIENCE REVIEW. 
from that produced when the substance is allowed to solidify in 
the ordinary way. It appeared to consist of a mass of pearly 
leaflets closely packed together round the bulb of the ther- 
mometer. 
Any final explanation of these phenomena is reserved until 
further experiments have been made. 
Since writing the foregoing, it has been said in explanation 
of the phenomena therein described, that the thermometer, 
though imbedded in the mass of the ice, did not really indicate 
the true temperature of the latter. With the object, therefore, of 
proving whether the ice is hot or not, I have, at the suggestion 
of Professor Eoscoe, made the following calorimetrical deter- 
mination : — 
The arrangement of the apparatus was so modified, that 
the ice, after being strongly heated, could be suddenly dropped 
into a calorimeter containing a known quantity of water of 
known temperature. The resulting temperature, after the ice 
had been dropped in, was read off by a thermometer graduated 
so as to indicate a difference of 0 o, 05 C. The weight of the ice 
was found by re- weighing the calorimeter. 
So far, I have only had the opportunity of completing the 
two following determinations, and in the second of these the 
weight of the ice could not be found, as a small quantity of 
water was lost out of the calorimeter, owing to a sudden jerk at 
the moment the ice entered it : — 
(1.) Weight of water in calorimeter, including the value of 
the latter = 185 gnus. 
Weight of ice dropped in = 1*3 grins. 
Temperature of calorimeter before . . = 13'4 
„ „ after . . = 13*6 
Rise in temperature = 0*2 
M (0-0 + 80 W = W (T — 0) 
(185 x 0-2) + (80 x 1-3) = 1*3 (T - 13*6) 
T = 122° C. Where T = temperature of ice. 
(2.) Weight of water in calorimeter, &c. — 185 grms. 
Temperature of calorimeter before . . = 12*7 
v ,, after . . = 12*8 
Rise in temperature = 0T 
On weighing the calorimeter after the experiment, the 
increase in weight was only 0*15 grms., but as a portion of the 
