247 
like forms which give chipped glass its decorative effect. Evidently there 
are forces involved here other than cohesion and adhesion, as these terms 
are commonly used. 
Most of the experimental work of this investigation was done by Mr. 
Elmer J. Harrel, now of the high school of St. Paul, Minm. 
Physics Laboratory of Indiana University. 
Bloomington. Ind 
