With a graceful curve Will plunged into the water as smoothly as if he had been oiled. A few long, powerful strokes brought him to the spot where his comrade was standing.

“Now,” said he, “get in there in front of me when the water comes up to the lower part of your chest. You use your legs wrong, and your arms too. Your arms don’t make a quarter the stroke they ought to, and your fingers are wide open, and your hands press out instead of down on the water too much. Keep your fingers together, and turn your palms so that they tend to lift you, instead of just pushing the water away on each side. And, moreover, finish your stroke!”

“And what about my legs?” asked Reube, humbly.

“Never mind them till we get the hands right,” insisted Will. “Now lean forward slowly, with your back hollowed well and chin up, your arms out straight ahead, and straighten your legs. Right! Now round with your arms in a big, fine sweep, drawing up your legs at the same time. That’s more like it. But your legs—you draw them up right under you with the knees close together. That’s all wrong. Didn’t you ever watch a frog, old man? As you draw up your legs spread your knees wide apart like one of those tin monkeys shinning up a stick. Try again. M-m-m! Yes, that’s something like what I want. You see, with the knees doubled up wide apart they have their separate motions as you kick them out again. The legs press the water down, and so do some lifting. The feet push you ahead, and at the same time you thrust a wedge of water backward from between your legs as they come strongly together.”

“That’s reasonable,” assented Reube, practicing diligently. In a few minutes he had made a marvelous advance in his method. Will sometimes swam beside him, sometimes stood on the bar and criticised.

All at once, in the midst of an encouraging speech he clapped his hands to his heart with a cry of pain, sank upon the sand, and called out sharply:

“Come here quick, quick, Reube!”

Reube remembered his lessons even in his anxiety, and with long, powerful strokes made his way swiftly to Will’s side. As he landed Will straightened himself up with a grave smile, and held one his hand to draw Reube back from the water’s edge.

“I’m all right now,” said he.

“But what was the matter?” queried Reube, in impatient astonishment.