Note 63 — SUPPOSED CHANGES IN THE MOON.
Reading edition
To some this may appear to be a mere truism. In reality it is far from being so. If two globes of equal mass were each of the same exact temperature throughout, they might yet have very unequal total quantities of heat. If one were of water, for instance, and the other of iron or any other metal, the former would have far the larger supply of heat; for more heat is required to raise a given weight of water one degree in temperature, than to raise an equal weight of iron one degree; and water in cooling one degree, or any number of degrees, would give out more heat than an equal weight of iron cooling to the same extent.