Her hope was that the gay Percy, seeing four, where he had expected only one, would be overwhelmed with numbers and would flee the premises early—­ to return no more.

Her faith in her plan was more than justified.  Percy had always been a little afraid of the Outdoor Girls—­ Betty in particular—­ but it is probable that if he had been able to meet them one at a time, he might have come off victorious.  As it was, he was routed, completely and ignominiously, leaving the girls to laugh at his discomfiture.

“There, I guess that is the end of that pest,” Mollie had said when she had recovered a little from her mirth.  “I imagine we won’t see him around these parts again.”

“I hope not,” Betty had answered with a satisfied little yawn.  “Wasn’t he too funny in that checked suit and awful green necktie?  Poor old Percy!  I suppose he can’t help it.  He probably just grew that way,”

She had been comparing him all evening with her splendid, upstanding Allen, and poor Percy had certainly not gained by the comparison.

The amusing incident served to divert their minds somewhat from the thought of Professor Dempsey, but the picture of him haunted their minds so continually day and night that the Outdoor Girls finally decided that something must he done about it.

“I can’t stand it any longer,” Betty confided to them one morning when they stood on Mollie’s porch discussing what course of action it would be best to take.  “I have a queer feeling that the poor professor is in desperate need of friends, and I don’t believe I’ll be able to sleep another night until I find out something definite about him.”

“Won’t he think we are sort of ’butting in’?” asked Grace, hesitating a little.  “He might think we came just out of curiosity.”

“I don’t think he would,” said Mollie.  “You know he invited us to come back some time when we could stay long enough for him to tell us something about those bugs and butterflies and things he sticks pins into

“That’s the idea!” exclaimed Betty quickly.  “We won’t have to tell him we know anything about his trouble.  If he tells us—­ why, all right, but if he doesn’t, of course we won’t try to force a confidence.  Anyway,” she finished soberly, “we’ll have the satisfaction of knowing we have done our best for him whether it really helps him any or not.”

“And we owe him a very great deal,” spoke up Amy softly.  “He really saved our lives, you know.”

So it was settled, and while the other three girls ran home to put on coats and hats and get ready for the drive, Mollie ran around to the garage and brought her big car to the front of the house.

She waved good-bye to her mother, who was trying rather wildly to keep Dodo and Paul from running under the wheels of the car and getting killed, and purred off down the street in the direction of Betty’s house.

When she arrived there she was a little surprised to see that Betty was backing her fast little roadster down the drive.