86 



Since the paper of which the preceding is an abstract 

 was read, Professor Kane has examined the EngHsh oil of 

 peppermint, which, when pure, has a density of 0,899, and 

 boils at S6(^^, Its composition is 



CjjitgaOj or 5{Cj^Hj+jf5j03 and per cent. 



Experiment. Theory. 



Carbon =80,14 - 80,15^ 

 Hydrogen n 11,76 - 11,48M00. 

 Oxygen = 8,10 - 8,373 



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 322^. It gave the formula, 



^4i^3s^2^^{^b^i} "^^2^2 ^"<^^ V^^' cent. 



Experiment. Theory. 



Carbon =83,49 - 83,73^ 

 Hydrogens 11,66 - 11,51 Cl00,00. 

 Oxygen = 4,85 — 4,863 



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 '' on 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 



