in Fhiids. 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. 



<:, d, is the level of the upper surface of the'ice in the 

 jar. 



^, /, is the level of the surface of the water standing 

 on the ice in the jar. 



