A poem by Joseph Fourier, with annotations in quotes

Part I: the primordial heat

when carrying a thermometer into the interior of the solid globe at great depths
it is the invariable temperature of deep places
the tenuous material strewn through various parts of space … such an assemblage of luminous or heated bodies
they all participate equally in the communal temperature

anywhere in the region of the heavens presently occupied by the solar system

de Saussure’s data suggest that Fourier erroneously continued to refer to [the values] as octogesimal [tr.]
“that is,  in units rendered by the difference between water’s boiling and freezing, divided by 80”
“Ferdinand de Saussure was grand-sired by a meteorologist.”

Part II: accessory causes [to] the secular cooling of the globe

mathematical expressions bereft of numerical application

the Earth, suddenly and almost entirely
the action of the atmosphere
the interposition of the atmosphere

For a globe made of iron
an interior fire, as a perpetual cause of several grand phenomena, has recurred in all the ages of Philosophy
…an immense time; there is no doubt about the truth of the conclusions, because I have calculated this time

above all the communication established by the currents: this last cause can totally change the results

[The text is from On the Temperatures of the Terrestrial Sphere and Interplanetary Space, Jean-Baptiste Joseph Fourier (1827), tr. R. T. Pierrehumbert]
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