1, These experiments “some 
conducted, those of Mt Cordier poreins the least ‘e 
ble, all lead to the conclusion of the tem mperature ine 
in proportion as we descend into the interior of the earth. 
But it is a prodigious leap, from these experiments in a small 
way, to the igneous liquidity of the central mass. 'Tempe- 
rature increases one degree for each twenty-eight metres; 
readily admit, the igneous fusion of our planet: but Cordier’s 
experiments on the wien fine of mines are not of them- 
selves sufficient to prov 
etter proofs exist, in ‘the bier of our globe at re 
poles, which the latest experiments seem to fix at 51,5: 
result requiring Thauidity. But the most decisive, and in abr 
opinion incontestible proof, is, that glassy obsidian and Pua: 
ice, half fused cinders, and trachytes, pearl stone are 
actually ejected from volcanos in a state of abeolute fusion 
in some instances, | high incandescence in others: 
that these fused and isa hot = Sa and not owing to coal 
_ set on fire, as Wern supposed, but are situated far below 
the coal fanatietsin in ibe granitic crust ; “of which, fr ents 
are often ejected. The reser = which these igneous and 
3. No allowance is ieide for the calotie given out at great 
depie in proportion as the lower part of the column of at- 
mospheric air is condensed by the weight and pressure of 
