In the Carricks' latest, intent nature-adventure, Christopher's father responds to his apprehensions about going in the pond--""There are things in there and the bottom is all mucky""--by getting each of them a face mask and a snorkel. And as the day progresses, Christopher becomes so absorbed in the pond's marvels--hunting for crayfish, trying to catch a turtle, spotting ""the biggest lake bass in the whole world""--that he drifts away from shore. With water in his mask, he panics; and dog Ben swims out and pulls him in. Now, though he'll watch himself, the pond holds no sea-monster fears: ""It was like being a fish myself."" This series continues to offer some of the best naturalistic drawing around--and almost the only such to depict a lifelike child. Once again: vigorous, calm, perceptive.