The Tarzan Twins, Dick and Doc, had become as hard as nails and as
active as a couple of manus, which you will know, if your education
has not been neglected, is the ape-word for monkeys. Then it was
that the big surprise came in a letter that Dick received from his
mother. Tarzan of the Apes had invited them all to visit him and
spend two months on his great African estate! The boys were so
excited that they talked until three o'clock the next morning
and flunked in all their classes that day. . . .