RESEARCHES ON THE VOLATILE HYDROCARBONS. 



K 



Of the Calculated Boiling-points of Hypkocarbons by Gebhardt's Thkokv 



We come finally to test the law of Gerhardt, above mention^). Inasmuch as this 



law was specially designed to apply exclusively to the lmlrocarb 

 served boiling-points of some of which it was indeed founded, 



upon the ob- 



>hould naturally 



expect to find this more in accordance with facts than either the hypothesis of Schro- 

 der or that of Lowig, both of which were claimed to be of more general application, 

 and were framed more especially with reference to other classes of substances. 



Th 



facts presented in the following tables will show, however, that this is far from beinir 

 the case ; and that the theory of Gerhardt, as well as those of Schroder and Lowig, so 

 far as these relate to the hydrocarbons, was by no means legitimately drawn from 

 nature, but is altogether artificial. 



1. Hydrocarbons from Pennsylvania Petroleum 



1st Series. 



Formula. 



Cg H 10 



Cio H 12 

 C 12 H 14 



Ci6 H 18 



^18 "2D 



Determined 

 Boiling-point. 



o.o (?) 



30.2 



61.3 



90.4 

 119.5 

 150.8 



Calculated Boiling- 

 point by Gerhard t's 

 theory. 



.0 

 12.5 

 33.0 

 53.5 

 74.0 

 94.5 



Difference between 

 Calculated and Deter- 

 mined Boiling-point. 



17.5 

 28.3 

 36.9 

 45.5 

 56.3 



2d Series.* 



Formula. (?) 



C 10 H 12 



C 12 II m 



C 14 H 16 



f 16 H w 



Determined 

 Boiling-point. 



8-9 



37.0 



68.5 



98.1 



127.6 





Calculated Boiling- 

 point by Gerhardt's 

 theory. 



12.5 

 33.0 

 58.5 



74.0 



Difference between 

 Calculated and Det< 

 mined Boiling-point. 



16.5 

 24.5 

 35.5 

 44.6 



53.6 





Formula. 



C20 H20 



i_'22 1*22 

 \J2A I -' 



24 



3d Series. 



Determined 

 Boiling-point 



174.9 

 195.8 

 216.2 



Calculated Boiling- 

 point by Gerhardt'* 

 theory. 



] 30.« I 



150.5 



171.0 



Difference between 

 Calculated and Deter- 

 mined Boiling-point 



* 



See foot-note on page 167. 



44.9 

 45.3 

 45.2 



