446 Prof. TyndalPs Contributions to Molecular Physics. 



degree of nicety ; otherwise the satisfactory agreement here exhi- 

 bited might be made still better. 



To render the experiments on liquid transmission more com- 

 plete, I operated with layers of various thicknesses, employing 

 throughout my most delicate galvanometer. The results of these 

 measurements are recorded in the following series of Tables : — 



Table IV. — Radiation of heat through Liquids. Source, red- 

 hot platinum spiral. Thickness of liquid layer 0*02 of an inch. 



Name of liquid. 



Bisulphide of carbon 

 Chloroform 

 Iodide of methyle 

 Iodide of ethyle 

 Benzole . . . 

 Amylene . . 

 Boracic ether . 

 Sulphuric ether 

 Formic ether . 

 Alcohol . . . 

 Water . . . 

 Total heat . . 



Deflection. Absorption per 100. 



4-0 

 12-0 

 260 

 27-5 

 31-3 

 38-0 

 39-0 

 39-5 

 40-0 

 40*5 

 43-7 

 48-0 



5-5 

 16-6 

 361 

 38-2 

 43-4 

 58-3 

 61-8 

 63-3 

 65-2 

 67-3 

 80-7 

 100-0 



Table V. — Thickness of liquid layer 0*04 of an inch. 



Name of liquid. 



Deflection. 



Absorption per 100 



Bisulphide of carbon 



o 



. 6-1 



8-4 



Chloroform . . . 



. 18-0 



25-0 



Iodide of methyle 



. 330 



46-5 



Iodide of ethyle . 



. 35-0 



50-7 



Benzole .... 



. 370 



55-7 



Amylene 



. 40-0 



65-2 



Boracic ether . . 



. 41-0 



69-4 



Sulphuric ether . 



. 42-0 



73-5 



Acetic ether 



. 42-1 



74-0 



Formic ether . 



. . 42-5 



76-3 



Alcohol .... 



. 43-2 



78-6 



Water .... 



. 45-0 



86-1 



Total heat . . . 



. . 48-0 



100-0 



