388 Proceedings of Philosophical Societies. [Nov. 
charms of a higher order, I have now arrived at a point where 
success is no longer doubtful. It must, however, be attained at 
a very considerable expense, which would not probably be 
replaced, by the works it might produce, for a long period of 
time, and which is an undertaking I should feel unwilling to 
commence, as altogether foreign to my habits and pursuits.” 
ArticLe XIII. 
Proceedings of Philosophical Societies. 
GEOLOGICAL SOCIETY. 
June 21.—Memorandum on a Substance contained in the 
Interior of certain Chalk Flints, by the Rev. J. J. Conybeare, 
MGS. 
The substance in question is a white powder, giving ona rude 
analysis, carbonate of lime (slightly tinged by iron), 72; silex 
(in the state of a fine sand), 28; = 100. The nodule of flint 
which contained it, presented no apparent trace of any aperture 
by which it could have entered. 
Memorandum on the Comparative Fusibility of certain Rocks, 
and the Character of the Results, by the Rev. J. J. Conybeare, 
MGS. 
These experiments were undertaken chiefly with a view of 
comparing the characters of the indurated lias shale (found in 
contact with the whin dykes) of the north of Ireland with those 
of certain rocks to which it has been supposed to bear an ana- 
logy. ‘The results tend (in the opinion of the writer) to establish 
the identity of the Irishrock with the shale of the lias formation, 
as occurring elsewhere, rather than with the true flinty slate or 
any other variety of basalt. Some experiments of the same 
nature on other rocks and artificial mixtures of mineral sub- 
stances are subjoined. They scarcely admit of an abstract. 
ARTICLE NIV. 
SCIENTIFIC INTELLIGENCE, AND NOTICES OF SUBJECTS 
CONNECTED WITH SCIENCE. 
‘Te Effect of Fixed Oils in destroying the Smell of essential Oils. 
Mr. Davies, druggist, of Chester, lately pointed out to a friend of 
‘the Editor, a fact which had accidentally occurred to him, and which 
he had not seen noticed in chemical books, A mixture of equal parts 
of castor-oil and peppermint water gradually loses the taste and smell 
s 
