A book that is a pleasure to read once and again—Buck (Sid and Sam, p. 65, etc.) scores with this entry in the My First I Can Read Book series. With a careful economy of words, Buck tells of a hopeful relationship between a girl and three cats. Using primarily four- word sentences and monosyllabic words, as well as internal rhyme for the sound of poetry, a girl urges cats to frolic with her. She tries to get them to swing, play hide-and-seek, and come down from a tree: ``If you stay, cats/we will play, cats. Up to you, cats./Be my new cats.'' Just when it seems the cats will run away, they all land together at her feet, in a cuddly heap. Fewer than 100 words faithfully employ repetition, yet also impart personality to the girl and the shy cats. The illustrations are full of mild humor and just the right amount of action, providing helpful clues for those deciphering the words. It can't be easy to make so few words add up to so much fun, but Buck and Westcott have done it. (Picture book. 5-8)