in Fluids. 335 



bottom of a tall glass jar was thawed by hot water stand- 

 ing on its surface. 



a^ is an earthen bowl filled with pounded ice and 

 water, in which the glass jar, b^ was placed. 



c, d, is the level of the upper surface of the ice in the 

 jar. 



d", y, is the level of the surface of the water standing 

 on the ice in the jar. 



