Note 14 — The General Proposition.[8]
Reading edition
It will again be noted that the isotherms inside of 32° - y° Far. were maintained by earth heat, and therefore independent of equatorial or polar exposure to solar heat. Consequently their intersections were upon different lines from those isotherms exterior to 32° - y° Far., which latter were mainly dependent upon solar heat. It will also be observed that solar heat, when it reaches the lower, denser regions of the atmosphere, is trapped and therefore capable of establishing and maintaining higher temperatures than in the upper atmosphere.