Splash!
The two boys disappeared in the water.
"Can they swim?" asked the guide, glancing a bit anxiously at the Professor.
"Like fish," answered Professor Zepplin tersely.
About that time two bobbing heads appeared above the water, only to disappear again, leaving some froth and a sea of bubbles on the surface. When next they appeared they were a long way from shore, but were swimming toward the bank, each with a hand on the other's coat collar, swimming with one hand.
"Look at the twin fish," howled Walter.
The swimmers did not answer him. They were too busy looking after themselves. Ned started to get to his feet as they reached shallow water, but Stacy was ahead of him. The fat boy butted Ned in the stomach, whereupon Stacy very calmly sat down on his companion's head, which was under water.
"Let him up!" cried Walter.
"Get off! He'll drown!" shouted the guide.
"Don't get excited. It will do him a lot of good to drown a few times. I've always observed that drowned persons are extremely well behaved persons."