218 C. M. Warren on the Volatile Hydrocarbons. 
point 3°; but this also was afterwards changed to 10° (Pogg. 
Ann., xiv, 372). (The other three components, having no direct 
bearing on the hydrocarbons, are omitted.) By means of these 
components Schréder (Pogg. Ann., xii, 188) proposed to calculate 
the boiling-points of different substances in the following manner. 
Having estimated the sum of the influence of the different com- 
; 
age grees exactly with the 
latest deter mination at the date of Schréder’s memoir. 
Lowig® estimates the influence of the elementary atoms on the 
: i 
hy oo nearly three times as great, as those of Schroder. 
erhardi 
carbons ¢ ha to obey a very simple law, according to which 
1 or depressed a certain number of degrees, correspond- 
ing to the n 
‘ Ae analone 1845, Ixiv, 367; 1846, Ixvii, 45. © Idem, 1845, Ixiv, 250- 
07. ° 
ue, 1845, [3], xiv, 1 
ition des hy: nes 
epee Seek 
