of Hydrocarbons and their Mixtures. 367 



Corrections to Dis. Gas point for Carbonic Oxide and 

 Nitrogen. 



Representative 

 P' c " point. y = 

 Nitrogen 5*95 -10 



Carbonic Oxide 3-75 -19 



Neglecting the oxygen this gives the mixture of marsh-gas 

 and hydrogen which forms the basis of the disilluminated gas. 

 The values of x are calculated from the analysis. From 

 the above point and the theoretical marsh-gas point we can 

 deduce a number which represents the hydrogen in gas. 



Hydrogen-Marsh- Gas line (Theoretical). 



Ax. 



Ay. 



X. 



y> 



0067 



•75 



•1482 



8*08 



•0045 



•76 



•1527 



8-84 



Hydrogen. 



Marsh-Gas. 



X. 



y> 







100 



•25 



13-23 



47-99 



37-64 



•1527 



8-84 



100 











1*95 (calc.) 



The number 1*95 for hydrogen is not to be taken as re- 

 presenting that hydrogen has this C.P., being rather an 

 indication of the course of the absorption-curve under the 

 given conditions, yet it is an interesting speculation what the 

 C.P. of hydrogen is, putting out of the question its power of 

 absorbing carbon. Of course when its blue flame is measured 

 against a yellow candle no comparison is obtained. But I 

 should like to see a good supply of hydrogen burned in a 

 referee's burner, and try to read by it. 



We do not use this number further here, but proceed with 

 the rest of the coal-gas. In a complete synthetical procedure 

 we should begin by building up the hydrogen-marsh-gas 

 mixture ; but the nature of our material rendered the present 

 course preferable. 



We have next to obtain what light we can as to the C.P. 

 of benzene. The mean of the two mixtures of benzene and 

 disilluminated gas* furnishes us with one point on a locus of 

 mixtures similar to the locus of the mixtures of dis. gas and 

 ethylene ; and we know the dis. gas point. According to the 

 analogy of the ethylene mixtures, a line through the mixture 

 and the dis. gas point should fall considerably below the true 

 benzene point, how much we have no means of knowing. 

 According to the following scheme this line would give the 

 number 240 for benzene. 



* The remark I made on the closeness of these mixtures, though sub- 

 stantially right, involved a mistake of calculation. The value arrived at, 

 however, was not materially affected. 



