Which preposition to use with earthiest

of Occurrences 1%

You will be but too likely, Doctor, to make the coarsest mistakes, when you fancy yourself most penetrating; to mistake the mere scurf and disease of the character for its healthy organic tissue, and to find out at last, somewhat to your confusion, that there are more things, not only in heaven, but in the earthiest of the earth, than are dreamt of in your philosophy.

Which preposition to use with  earthiest