The manner in which Phi-oo and Tsi-puff attacked the problem of speech was fairly obvious. They came into this “hexagonal cell” in which Cavor was confined, and began imitating every sound he made, beginning with a cough. He seems to have grasped their intention with great quickness, and to have begun repeating words to them and pointing to indicate the application. The procedure was probably always the same. Phi-oo would attend to Cavor for a space, then point also and say the word he had heard.

The first word he mastered was “man,” and the second “Mooney”⁠—which Cavor on the spur of the moment seems to have used instead of “Selenite” for the moon race. As soon as Phi-oo was assured of the meaning of a word he repeated it to Tsi-puff, who remembered it infallibly. They mastered over one hundred English nouns at their first session.

Subsequently it seems they brought an artist with them to assist the work of explanation with sketches and diagrams⁠—Cavor’s drawings being rather crude. He was, says Cavor, “a being with an active arm and an arresting eye,” and he seemed to draw with incredible swiftness.