A child in a bathtub is hardly alone. His imagination brings him as unlikely and thrilling a barrage of visitors as ever delighted the young ""tubber"" -- one snail, two turtles, three ducks and so forth on to eight alligators, nine hippopotamuses, and ten minnows. As the seven hungry bears arrive each one atop a honey jar, as the six kangaroos descend with their red-striped umbrellas, as five whales flop down in soapy slides, our little reader will be counting his way happily through the entire bright and comic menagerie. Because each group is counted and recounted so often, he may even commit the whole tubful of bathroom guests to memory by the time he is ready to be towelled. What a happy way to begin arithmetic!