84 
easily procured in commerce, Professor Kane considered 
that the determination of the composition of the products of 
certain members of a botanical group, whose natural con- 
nexion is among the best marked, might tend to throw some 
light upon the question at issue. He, therefore, examined 
the oils of the origanum vulgare, lavandula spica, mentha 
piperita, mentha puleghium, and mentha sativa. Great diffi- 
culty was found in obtaining the specimens so absolutely 
pure as to fit them for analysis, as all such oils contain small 
quantities of solid matters, (camphors of the essential oils, 
stearoptens,) which render impure the later products of the 
rectification. 
Repeated analyses of the oil of the mentha puleghium, 
gave for its composition the same formula as for oil of tur- 
pentine, or oil of lemons, that is c,H,, or per cent. 
Theory. Experiment. 
Carbon = 88,45 — 88,56 
Hydrogen = 11,55 — 11,87 
Its boiling point is about 314° F., the same as that of tur- 
pentine. 
The oil of mentha sativa, boiling at 320° F., gave, by 
several accordant analyses, the formula, 
Cz,H,,0 or 7{c,H,}-+0, and per cent. 
Theory. Experiment. 
Carbon = 85,67 — 83,66 
Hydrogen = 11,15 — 11,38 
Oxygen = 3,18 — 2,96 
The oil of the origanum vulgare, boiling at 324° F., gave 
as the result of five analyses, which varied very little from 
one another, the formula, 
C;)H,,0 or 10{c,4,}+0, and per cent. 
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