86 
Since the paper of which the preceding is an abstract 
was read, Professor Kane has examined the English oil of 
peppermint, which, when pure, has a density of 0,899, and 
boils at 865°. Its composition is 
C,,H,, 0, or 5{c,H,}-+-H,0, and per cent. 
Experiment. Theory. 
Carbon = 80,14 — 80,15 
Hydrogen= 11,76 — 1 Last 100. 
Oxygen = 8,10 — 8,37 
This formula differs from Blanchet’s in the hydrogen, which 
Blanchet’s formula makes 10,9. 
Oil of rosemary has been likewise examined, its density 
is 0,85, and it boils at 332°. It gave the formula, 
C,,H,,0,=9{c,H,}+H,0, and per cent. 
Experiment. Theory. 
Carbon = 83,49 — 83,73 
Hydrogen= 11,66 — 11,5! 100,00. 
Oxygen = 4,85 — 4,86 
The foreign oil of peppermint Professor Kane considers 
to be a mixture of nearly equal parts of genuine oil and of 
oil of turpentine; and hence the results obtained in its ana- 
lysis as detailed above. 
A paper “fon Atmospheric Electricity” was then read 
by Edward S. Clarke, Esq. 
The author having lately erected, at his residence near 
Palmerston, an apparatus adapted to observations on this 
subject, he exhibited to the Academy a drawing of the in- 
strument. He stated, that in bringing the subject under 
the notice of the Academy, he had two objects in view,— 
the first, to compare the results of his experiments with 
those previously obtained by other observers; and the se- 
cond, to induce others to erect similar instruments, feeling 
