Prof. Tyndall's Contributions to' Molecular Physics. 453 



Table of Proportional Volumes. 



Bisulphide of carbon . . 0*48 



Chloroform 0*36 



Iodide of methyle . . . 0*46 



Iodide of ethyle .... 0'36 



Benzole 0-32 



Amyiene 0.26 



Alcohol 0-50 



Sulphuric ether .... 028 



Formic ether 0*36 



Acetic ether 0*29 



Water 1*60 



Employing the vapours in the volumes here indicated, the 

 following results were obtained : — 



Table XI. — Radiation of heat through Vapours. Mass of 

 vapour proportional to mass of liquid. 



Name of vapour. ^tST" ™*f™' ^T 

 Bisulphide of carbon . 048 j j*^} 4-3 



Chloroform .... 036 { 13-0 } 6 ' 6 



Iodide of methyle . . 0-46 j j^l 10'2 



Iodide of ethyle . . 0-36 {30*6} 15 ' 4 



Benzole 032 {33a} 16 ' 8 



Amyiene 0*26 37'7 190 



Sulphuric ether . . . 0-28 {42*6} 21 ' 5 



Acetic ether. . . . 0-29 {4*0} 22 ' 2 



Formic ether . . . 0*36 {44^7} 22 ' 5 



Alcohol 0-50 {44.9 1 22 '7 



Here the discrepancies revealed by our former series of expe- 

 riments entirely disappear, and it is proved that for heat of the 

 same quality the order of absorption for liquids and their vapours 

 is the same. We may therefore safely infer that the position of 

 a vapour as an absorber or radiator is determined by that of the 

 liquid from which it is derived. Granting the validity of this 



