"Oh, I'll get you home safe," declared Sid. "We'll have a nice walk. I'll be ready in a jiffy," and he proceeded to load his camera with films. It was a large one, and he often used it to make pictures which had a bearing on his class work in biology and evolution. The three chums were soon strolling along the banks of the river, Sid on the lookout for late-staying birds or some animal or reptile which he might add to his photographic collection.