“Greater than Mary Frances shows when drinking chocolate soda?” queried Eleanor.

“That’s a question,” laughed Billy. “I’ve never seen many aphis-lions eat, but I have seen Mary Frances drink chocolate sodas ‘galore.’”

“But, Billy,” reminded Mary Frances, after they had finished laughing, “you haven’t told us what other enemies the aphids have, nor what you mean by using a spray.”

“Oh, if you stop to think, you’ll realize that spiders and several different kinds of birds will eat them. They are such stupid little creatures that it’s not difficult to find or catch them.”

“But what about spraying—is that difficult?” asked Eleanor. “You see, I want to surprise Bob with my superior knowledge.”

“Oh, Billy, do give us just as many lessons as you can possibly squeeze into the time Eleanor visits us, won’t you?” cried Mary Frances. “Do tell us about spraying or any other thing we ought to learn about gardening.”

“Why, Mary Frances, you talk as though I knew a lot on the subject!” said Billy, “when, as a matter of fact, I don’t begin to know anything. It seems to me that the more I study, the more there is to learn.

“I’m willing,” he went on, “to tell you girls what I can remember of what Professor Weed told about insect pests and insecticides—but I do wish you were both boys!”

“We don’t, though. Do we, Eleanor?” said Mary Frances. “I shouldn’t think you’d mind. You’re always with boys during the school term, and—I don’t believe they’d listen anything like as well as Eleanor and I will.”