Jules Verne,
From the Earth to the Moon — Chapter XIX
“ If I were a natural philosopher, I would tell him that if less of caloric were set in motion upon the planets which are nearest to the sun, and more, on the contrary, upon those which are farthest removed from it, this simple fact would alone suffice to equalize the heat, and to render the temperature of those worlds supportable by beings organized like ourselves. If I were a naturalist, I would tell him that, according to some illustrious men of science, nature has furnished us with instances upon the earth of animals existing under very varying conditions of life ”
