M. R. Bunsen on the Law of Absorption of Gases. 129 



If the arithmetical mean from 1, 2, 3, 4, from 3, 4, 5, and 

 4, 5, 6, are used for the conditional equations for the interpola- 

 tion formula, we obtain, 



c =0-0871 -0-0033242 / + 0-0000603* 9 , (23) 



and from this the coefficients between the temperatures of 0° 

 and 20° are,— 



7. Olefiant Gas in Water. 



The gas was prepared with the well-known precautions from 

 alcohol and sulphuric acid. To free it from the vapours of tether 

 and alcohol, and from traces of other hydrocarbons polymeric 

 with elayle, a ball of coke, saturated with concentrated but not 

 fuming sulphuric acid, was placed in the gas until nearly the 

 half of it was absorbed ; a ball of potash was afterwards intro- 

 duced, and left in contact with the gas for some time. Eudio- 

 metrical analysis proved the purity of the gas : — 



The interpolation formula is obtained from combination of 

 1, 2, 3 and 2, 3, 4 and 3, 4, 5, 



c=0-25629-0-00913631/ + 0-000188108^, . . . (24) 



and hence the coefficients between 0° and 20° : — 



'C Coefficient. Difference. 



l 2 °f. 0-0090 



:;.;',•' 00085 



JJgJ 0-0082 

 00079 



V - 1 / I 



0-2388 

 0-2808 



0-2227 

 0-2153 

 0-2082 



0-0074 

 00071 



°C Coefficient. ! Difference.) °C Coefficient. Difference. 



00041 

 00037 

 00032 

 00030 



00025 



Phil. 



May. S. 4. 



0-2018 JJnH 



0-1952 ' !? ! 



01893 1™% 



0-1780 : 00061 



' 0-0049 



01 737 " ;• 



01693 (,0,,U 



Vol. 9. No. 57. Feb. 1855. 



0-1652 

 01615 

 01583 

 01553 

 01528 



K 



