528 Prof. TyndalPs Contributions to Molecular Physics. 



coal-gas with that of our hydrogen-flame, I reduced the former 

 to the dimensions of the latter. The flame thus diminished had 

 a blue base and bright top, and the whole of it was permitted to 

 radiate through our series of liquids. The following results 

 were obtained : — 



Table XL. — Radiation through Liquids. Source, small gas- 

 flame. Thickness of liquid layer 0*07 of an inch. 



Name of liquid. Deflection. Absorption. *™?L 



Table XXXIX. 



Chloroform .... 287 39'8 49-3 



Bisulphide of carbon . 36-0 53'2 27*7 ' 



Iodide of ethyle . . 41-7 72-3 756 



Benzole 43*4 79'4 82-3 



Amylene 45-0 86-1 87'9 



Sulphuric ether . . 46*6 93-3 9.2-6 



Formic ether . . . 46-6 933 93*5 



Alcohol 46-8 94-1 



Acetic ether .... 46-9 944 93-9 



Water 47'4 97"1 100-0 



Total heat .... 48-0 100-0 



I have placed the results obtained with the hydrogen-flame in 

 the third column of figures. For some of the liquids it will be 

 observed that the absorption of the heat issuing from the small 

 gas-flame is nearly the same as that 'of the heat issuing from the 

 flame of hydrogen. A very remarkable difference, however, 

 shows itself in the deportment of bisulphide of carbon as com- 

 pared with that of chloroform. For the small gas-flame chloro- 

 form is the most transparent body in the list ; it is markedly 

 more transparent than the bisulphide of carbon, while for the 

 hydrogen-flame the bisulphide greatly excels the chloroform in 

 transparency. The large luminous gas-flame previously experi- 

 mented with differs also from the small one here employed. 

 With the large flame, the absorption by the bisulphide is to that 

 by the chloroform as 



100 : 121, 



while with the small flame the absorptions of the same two sub- 

 stances stand to each other in the ratio of 



100:76. 



Numerous experiments were subsequently made, with a view of 

 testing this result, but in all cases the bisulphide was found 

 more opake than the chloroform to the radiation of the small 

 gas-flame. The same result was obtained when a very small oil- 

 flame was employed ; and it came out in a very decided manner 



