348 Scientific Intelligence. 
a 
cence to the phenomena of heat in question, a term which is certainly 
b 
Co. of New York), common geass’ 
rubber (as used in forming gas bags), gutta percha, and various crystal 
lized mineral substances. But these last, becoming always positive, 
not be further alluded to. The sulphur by friction with the guna 
always became positive, and also by friction with different sheets of i 
Paper, except in a single instance, when using the paper which was 
ee 
