Prof. TyndalFs Contributions to Molecular Physics. 509 



Table XII. — Radiation of heat through Vapours. Source of 

 heat, platinum spiral barely visible in the dark. 



Name of vapour. Deflection. Absorption per 100. 



o 



Bisulphide of carbon . . 7*5 65 1 



Bisulphide of carbon . . 7*45 6*4 J 



Chloroform 10*5 £H 1 



Chloroform 10-5 9*1 J 



Iodide of methyle . . . 14*5 12*5 1 



Iodide of methyle . . . 14*5 12*5 J 



Iodide of ethyle .... 24-2 20-91 



Iodide of ethyle .... 24-5 21'1 J 



Benzole 31-0 26*7 



? 



Benzole 300 25 



Amylene 37*6 35-61 



Amylene 37*8 35*9 J 



Sulphuric ether .... 41*1 43-41 



Sulphuric ether . . . . 41-0 43 -4 J 



Formic ether 41-7 45-0 \ 



Formic ether 41*8 45'3 J 



Acetic ether 43 "6 49-8 I 



Acetic ether 43-4 49*3 J 



On the 10th of October the following results were obtained 

 with the same platinum spiral, raised to a white heat : — 



Table XIII. — Radiation of heat through Vapours. Source, 

 white-hot platinum spiral. 



o 



Bisulphide of carbon . . 3*5 2*9 1 



Bisulphide of carbon . . 3-4 2*8 J 



Chloroform 6'7 5*6 1 



Chloroform 6*7 5*6 J 



Iodide of methyle ... 92 7'7 \ 



Iodide of methyle ... 9*4 7*9 J 



Iodide of ethyle .... 15*4 13*0] 



Iodide of ethyle .... 15*0 12-6 J 



Benzole 19*3 166 ) 



Benzole 190 10*4 } 



Total heat 59*2 100*0 



Amylene 27*6 22*61 



Amylene 27*7 22*7 J 



Formic ether 30*5 25*0 1 



Formic ether 30*7 25*2 J 



Sulphuric ether .... 31*4 25-71 



Sulphuric ether .... 31*7 26*0 J 



Acetic ether 33*0 27*0 1 



Acetic ether 33*2 27*3 J 



Total heat 60*0 100*0 



