of Hydrocarbons and their Mixtures. 



359 



Hydrogen and Ethylene Mixtures. 



I. y = 68-5e 3,6( *- 5) , 

 II. # = 178*4 a- 3 + 85 # + 3'7. 



X. 



y obs. 



//I- 



error. 



y II. error. 



•5 



68-5 



68-5 





68-5 



•437 



54-58 



54-60 



+ "02 



55-7 +1-1 



•406 



4937 



48-83 



- -54 



5015 + -78 



•349 



39-21 



39-78 



+ -57 



40-95 -fl-74 



•262 



30-85 



29-08 



- 177 



29-19 -1-66 



•207 



22-84 



23-85 



+ 10 



22-88 + -04 



•118 



6-73 



17-32 



+10-59 



1402 +7-29 



For the percentages see p. 121. 



The upper values are best represented by I., the lowest 

 three by II. Even II. gives 14 candles for the last, as against 

 6*7 observed. 



Nitrogen. — The nitrogen-ethylene mixtures present a 

 general analogy with the hydrogen-ethylene mixtures, and 

 may be conveniently compared with them. The values of y 

 are lower. The representation by a logarithmic curve is 

 excellent. The algebraical form failed. 



Nitrogen and Ethylene Mixtures. 

 3,=68-5/- 6( *-' 5) . 



X. 



?/obs. 



y calc. 



Error. 



•5 



68-5 



68-5 





•4585 



51-96 



52-09 



+ -13 



•4156 



39-58 



39-25 



- -33. 



•3747 



2964 



29-96 



+ -32 



•3201 



20-81 



20-88 



+ -07 



•2660 



11-82 



14-62 



+2-80 



•2237 



7-20 



11-06 



+3-86 



The last values illustrate again the falling away of values 

 of y below 15. 



We will now discuss more thoroughly the ethylene-marsh- 

 gas mixtures used in my former paper. I have adopted a 

 different line from that used in the former paper, the first 

 mixture seeming to be affected by a curvature, which leads 

 from the line of the mixtures to the " direct " ethylene point. 

 This curvature seems to be the source of the difference be- 

 tween the " direct" and "indirect" ethylene points mentioned 

 in the last paper, the values of y for which were 68*5 and 



2C2 



