The publishers describe this book and a previous one (Uphill and Downhill. 1965, p. 623- J-201) as, ""...an open-end primary experience and experiment series in which the real experiences of children from four to eight are the basis for exploration and discovery in science."" The author addresses his text directly to his text directly to his audience in a sort of vers libre padded with needless comment--""Four wheels on the ice-cream truck/Jingling along/ With an ice-cream song/ Ices...popsicles/ Cones with sprinkles/ Inside the deep frosty freeze./ Will the truck stop/ for you today?"" The reader is invited to make his own experiments, such as to slide on one foot and then on one skate and then decide for himself which is easier, and to count the wheels on trucks. Directions in text and pictures are given for making axles and wheels from pencils and paper plates. The upshot of it all is that round is a good shape for rolling and that readers can find out a lot about wheels by looking and experimenting.