Thermal Conducivity of Vulcanite. 



21 



3 

 35 ' 



1,1 f H? P resents ' wl ttout any of its elaborate system of 

 K? the , a PP a ^ a . tus ^ich we used in determining the 

 substances " ltl6S ' between °° °- aud 100 ° °-> of various 



7473? 



