1903.] MABERY—THE COMPOSITION OF PETROLEUM. 47 
of Ohio crude oil. The series C,H,,_, does not appear in Penn- 
sylvania oil within the range of distillates below 300°, but it does 
appear in Ohio oil. The proportions of the series still poorer in 
hydrogen in the residues of distillation from Ohio oil are doubtless 
still greater. 
CANADIAN CORNIFEROUS LIMESTONE PETROLEUM. 
In the paper referred to above, the composition of the distillates 
from Canadian oil was explained, including the hydrocarbons 
C,,H,, and C,,H.,, which were identified in the fractions 196° 
and 214°: This limits the series C,H,, 4. in Canadian oil to the 
lower members. ‘Two years ago the higher fractions were exam- 
ined for the individual hydrocarbons and results obtained, not yet 
published, that show a continuation of the series C,H,, ; and the 
hydrocarbons separated included the following: C,,H.., C,;H.,, 
CiHy,, CisH 9, C,H. 
These bodies were identified by combustion for the series, and 
their molecular weights ascertained for the individual members of 
the series ; the specific gravity of each hydrocarbon agrees closely 
with that of the corresponding hydrocarbon of Ohio petroleum. 
These values were still further confirmed by the formation and 
analysis of the chlorides. 
The proportions of the lower members of the series C,Hi»1;, 
which form the naphtha and gasoline in Canadian petroleum, is 
considerably smaller than in Ohio petroleum. The proportion of 
burning oil distillates is also less, and it is not possible to make 
from Canadian oil sv good burning oil. The series C,H,, shows 
less stability on standing than the higher series C,H,,,,. I have 
samples of burning oil from Canadian petroleum that have stood 
ten years; they have changed from ‘‘ water white,’’ the original 
quality of the oil, to very dark yellow. Much larger quantities of 
gas are evolved in refining the Canadian oil, which is run back for 
heating the stills. Some paraffine is made, but the yield is small. 
The sulphur in the crude oil gives much trouble in refining, and 
it is not all removed in the burning oil. The percentage of sul- 
phur is higher than in Ohio petroleum as a rule, usually about one 
per cent. Canadian petroleum should give good grades of lubrica- 
tors, but I have never examined these products. 
