Monsieur Auzout's speculations of the changes, likely to be discovered in the Earth and moon, by their respective Inhabitants

This inquisitive philosopher in a letter of his, lately written to his correspondent in London, takes occasion to discourse of his considerations concerning those changes, mentioned in the title, as followes; I have (saith he) sometimes thought upon the changes, which 'tis likely, the supposed inhabitants of the moon might discover in our Earth, to see, whither reciprocally I could observe any such in the moon.