OF ARTS AND SCIENCES. 



475 



1.38 1.12 .94 A 



G 



H 



No Medium Intekposed. 



"Xt" 



M 



m 



Iodine ix Carbon Disulpiiide. 



Lampblack. 



i-:fi>Z^^^^P^^. 



Hard Rubber. 



Red Glass. 



Red Glass (double). 



l!i;i) AND ISlUC (jl.ASS. 



Asphalt Vaunisil 



1.33 1.12 .94 k 



H 



