250 Ice and its Natitral History 



In Table III we have the upper critical temperature (T) 

 at which the coefficient of apparent dilatation changes sign 

 for blocks of ice having volumes ranging from 100 cubic 



-0'4 0'3 -0*2. -07 



Fig. 2. The Thermal Expansion of Ice containing I'Sio-i gram NaCl. 



centimetres to 100 cubic metres, each containing 1*5105 gram 

 NaCl. Under V^ we have the initial volume of the block of 

 ice supposed pure and solid at o C., and under v the volume 



