Every afternoon we go bike riding. . . If I have to cross the street. . . I look both ways and walk my bike across. . . I watch for car doors that are open. . . I always start home before dark . . . ."" It reads like a run-of-the-training-wheels safety lesson, but the pictures make it something else again. For all the while that the little boy is demonstrating correct bike habits, his bear--who grows enormously as soon as he is astride his tiny bike--provides cautionary evidence of the consequences of ignoring them. Barreling into an open car door and a letter-carrying mailman, braking too late at a stop sign and crossing in front of a milk truck, the ponderous, show-off bear causes and suffers upsets wherever he goes. Yet--just because he's really the boy's toy bear, he is still around at the end, bandaged and back to his proper size, enjoying cookies with the boy in their kitchen. The lesson couldn't be clearer or more disarmingly taught.