of Hydrocarbons and their Mixtures. 369 



means of determining completely the two following loci, with 

 three independent points at least on each : — 



(1) The dis. gas-benzene locus. 



(2) The dis. gas-heavy hydrocarbon locus. 



For the sake of clearness I give here equations representing 

 these loci as far as the material permits, taking the entire gas 

 as one point on the second locus. 



(1) Dis. Gas-Benzene. 



Dis. gas -1415 7*33 



Dis. Gas-benzene mixture ... *2013 23*54 



Benzene 1 262*4 



These are represented by the equation, 



r -7-33 = 35'40 (*-■ 1415) 3 + 271 [>--1415). 



(2) Dis. Gas-Heavy Hydrocarbons. 



Dis. Gas -1415 7^33 



Total Gas -1782 16 



Hydrocarbon mixture ... *69 142*4 

 These are represented by the equation 



y -7-33 = 34-54(tf--1415) 3 + 236(.z--1415). 



There is much to be said in favour of the rectilinear method. 

 The curves can be represented for some purposes by lines 

 drawn to points below the real points, as we saw in the last 

 paper, and corrections otherwise troublesome may be em- 

 bodied in this form of procedure. But the curves cannot be 

 neglected if we wish to understand the matter. 



As an illustration of the use of the rectilinear method just 

 alluded to, let us replace the two last steps by similar steps 

 founded on the rectilinear value of benzene, 240. 



Rectilinear Value of Benzene, 240. 



Heavy Hydrocarbon mixture, Benzene and Ethylene, 



x. y. 



Benzene 1 240 



Ethylene *5 68*5 



Hydrocarbons ") 



H = 4-32 £> -690 133-7 (calc.) 



C=2-98 ) 



Total Gas. 



x. y. 



Hydrocarbons ... -690 133*7 



Dis. Gas -1415 7«33 



Total Gas 4782 15*77 (calc.) 



