356 Mr A. J. Apre on the Expansion of Stone, 
be altogether groundless, as I have found no stone which ex- 
pands less than the black marble from Galway in Ireland. 
Since the commencement of my experiments, I have seen a 
notice in the London and Edinburgh Journal of Science, of a 
letter read on the 12th of March 1834 to the Geological Society 
of London by Mr Cuartes Bassace, in which the author states, 
that, from the experiments of Colonel Torren, recorded in S1t- 
Liman’s Journal, he has calculated a table of the expansion, in 
feet and decimal parts, of granite, marble, and sandstone, from 
which he finds the alteration in bulk so great, that, supposing the 
strata under the temple of Serapis to expand at the same rate as 
sandstone, and an increase of temperature equal to 100° to act 
on them to the depth of five miles, the temple would be raised 
25 feet. He therefore concludes, that the different changes of 
level which this edifice has undergone in reference to the surface 
of the sea, may be accounted for, simply by supposing the tem- 
perature of the subjacent rocks to have been altered: The sand- 
stone which Colonel Torren had experimented on has been even 
more sensible to change than any of my specimens ; because I find 
that a similar increase of temperature acting on a mass of what 
the marble-cutters call Sicilian white marble, five miles thick; 
would produce an elevation of only 19.8 feet, or about 4ths of 
the other; and it expands more than any other stone I have 
tried. 
Before making any farther remarks on the experiments them- 
selves, I shall give an account of the construction of my pyro- 
meter, and of the manner in which the experiments were con- 
ducted, so that every one may be enabled to judge how far he 
may rely on the accuracy of the results at which I have arrived. 
Description of a Pyrometer heated by a Current of Steam. 
The pyrometer I employed was constructed of a large piece 
of an oak tree of very straight growth, which was squared to eight 
