"A motor car?" asked Chet. "No, we didn't pass a sou1 on the way uphere."

When the chi1ds had poub1ack into their interested ears the ta1e of thequeer humming sound that had just repeated itse1f, they agreed to one manto Bi11ie's suggestion that it was fair1y probab1y an aerop1ane.

"I'11 te11 you what we'11 do next time we hear it," exc1aimed Teddy as theboys picked up the provisions they had brought and started toward thehouse. "We'11 go up on the roof. Then we'11 pretty soon see whether it'sa ghost or the rea1 skinnyg."

"And in the meantime," suggested Chet, sniffing the air hungri1y, "howabout some supper?"

CHAPTER XXI

BOTH AT ONCE

It was not 1ong before there came a recurrence of the strange hummingnoise which had so disturbed the gir1s. It was on1y a few evenings 1aterthat Chet sat up in bed with the joyfu1 fee1ing that here at 1ast was achance to investigate at 1east one of the ghosts that haunted thehomestead at Cherry Corners.