RESEARCHES 
2p SeEries.* 
ON THE VOLATILE HYDROCARBONS. 
. Calculated Boiling- | Difference between 
Determined ey eae: 
se ||| keene | ae Gee 
° 
G Hy 8-9 0 8-9 
10 Hig 37.0 20 17.0 
vw Hy 68.5 40 28.5 
Cy, Hyg 98.1 60 38.1 
Cyg Hig 127.6 80 47.6 
3p Series. (Not completed.) é 
i Calculated Boiling- | Difference between 
D d : ollog 
Formula. eluent point ene 8 cules oe 
Go) ° ° 
Cy Ho 174.9 130 44.9 
Cop Hag 195.8 150 45.8 
Cy Hey 216.2 170 46.2 
2. Hydrocarbons from Coal-tar Naphtha. 
Calculated Boiling 
Difference between 
Name of Substance. Formula. Sata dee. point ee Pon ame 
Benzole, Cy He 80.0: 80 0.0 
Toluole, Cy Hg 110.3 100 10.3 
Xylole, Cig Hye 139.8 120 1%8 
Isocumole, Cig Fis 169.9 140 29.8 
3. The Homologous Hydrocarbons from Oil of Cumin and Cumime Acid. 
Determined +| Calculated Boiling- | Difference between 
Name of Substance. Formula, Boiling-point. point by Schréder’s |Calculated and Deter- 
“Dome theory. mined Boiling-point. 
° ° ° 
Cumole, Cig Aye 151.1 140 IL. 
Cymole, 9 Hyg 179.6 160 19.6 
It appears, therefore, that the theory of Schréder finds no support from any one of 
the different series of hydrocarbons presented in these tables. The discrepancy be- 
tween the observed and calculated boiling-points, as shown, varies from about 10° to 
50°C. This discrepancy is found to increase pretty uniformly by about 10° as we rise 
from one member to the next higher in the ascending series. In the series of the 
formula C, H,, however, the discrepancy is nearly a constant one, viz. about 46° I 
would not overlook the fact, that the calculated boiling-point of benzole is absolutely 
identical with that found by experiment; nor the remarkable coincidence, that the 
agreement is almost perfect between the probable boiling-point, and that obtained by 
* See foot-note on page 167. 
