PROFESSOR TYNDALL’S CONTRIBUTIONS TO MOLECULAR PHYSICS. 
349 
Table XVIII. — Radiation through Vapours. Source, Leslie’s cube at 212° Fahr. 
Name of vapour. 
Deflection. 
Absorption. 
Bisulphide of Carbon . . 15*0 
6*6 
Iodide of Methyl . 
. . . 38-3 
18*8 
Chloroform . 
. . . 40-7 
21*6 
Iodide of Ethyl 
. . . 46-2 
29*0 
Benzol .... 
. . . 50*0 
34*5 
Amylene . . . 
. . . 57*8 
47*1 
Sulphuric Ether . 
. . . 60-3 
54*1 
Formic Ether . . 
. . . 62-1 
60*4 
Acetic Ether . 
. . . 64-3 
69*9 
Total heat . 
. . . 71-4 
100*0 
The absorption by formic ether is here also 6*3 per cent, in 
excess of that effected 1 
sulphuric ether ; while, as in the last two Tables, chloroform excels iodide of methyl. 
Preserving the quality of the heat 
unchanged, but reducing its quantity from 71 c 
=227 units to 52°*3=86*5 units, the 
following results were 
obtained : — 
Table XIX. 
Name of vapour. 
Deflection. 
Absorption. 
Iodide of Methyl . 
. . . 16*5 
18*3 
Chloroform . . 
. . . 18*5 
20*6 
Iodide of Ethyl 
. . . 24*4 
27*1 
Benzol .... 
. . . 30*0 
33*3 
Amylene . . . 
. . . 38*6 
48*6 
Sulphuric Ether . 
. . . 40*3 
53*2 
Formic Ether . 
. . . 42*8 
60*0 
Placing the figures of Tables XVI., XVIII. and XIX. side by side, we have an oppor- 
tunity of seeing how results obtained on different days check each other. 
Table XX. — Source, blackened cube of boiling water. 
Name of vapour. 
Absorptions from 
A 
Table XYI. 
Table XVIII. 
Table XIX? 
Bisulphide of Carbon . 
. . 6*4 
6*6 
Iodide of Methyl . . 
. . 18*4 
18*8 
18*3 
Chloroform .... 
. . 19*5 
21*6 
20*6 
Iodide of Ethyl . . 
. . 
29*0 
27*1 
Benzol . ... 
. . 
34*5 
33*3 
Amylene .... 
. . 
47*1 
48*6 
Sulphuric Ether . 
. . 54*8 
54*1 
53*2 
Formic Ether . . . 
. . 60*9 
60*4 
60*0 
Acetic Ether 
. . 
69*9 
