G3 ROYAL SOCIETY OF CANADA 



Change in volume of ice and water = .2517 c.c. Amount of ice 

 formed = 2.79 c.c. 



Area of mantle by rough calculation was about 130 sq. c. 



Thus 2.79 c.c. of ice grew on a surface of 130 sq. c, hence the 

 thickness of mantle increased about .021 cm. in eight days. 



Second Experiment. 



Although great precautions were taken in the previous experiment, 



it was thought that possibly some impurity might have been present 

 to account for this growth. Accordingly, all the vessels were carefully 



30 



24 



'20 ^0 60 BO /oo //o 



Time in Hours 



Fig. 

 Rate of increase with liquid air again. 



cleaned and the calorimeter was packed in a mixture of cradled ice and 

 water. The refrigerant used was snow and salt at a temperature of 

 about — 15° C. After some trouble a very good mantle was formed. 

 An immediate rise was noted in tihe capillary, but the rate was much 

 faster than in the previous case. The same increase in the rate was 

 noticed, but this commenced at the end of the first day. Fig. 3 shows 

 this change. The rough appearance of the mantle and the small 

 spicules were again noticed. 



