80 



the surface as it advanced through the solid. It is finally shown 

 that these surfaces are due to the liquefaction of the ice in planes 

 perpendicular to the pressure. 



The surfaces were always formed with great facility parallel to 

 those planes in which the liquid flowers already described are pro- 

 duced by radiant heat, while it is exceedingly difficult to obtain them 

 perpendicular to these planes. Thus, whether we apply heat or 

 pressure, the experiments show that ice melts with peculiar facility 

 in certain directions. 



The Society then adjourned over the Christmas holidays, to 

 January 7, 1858. 



