A somewhat fragile looking little boy tells his even littler sister about all the heroic deeds he will accomplish when he grows up. He'll scale a perpendicular mountain and bring her the topmost stone; he'll do all her arithmetic for her; he'll build her an interplanetary bridge. The quaint, fine-lined pictures in grey and faint shades of green and pink, interpret the lad's bold boasts in a delicate way. The result: a sweet book which some relatives will choose for their nieces and nephews or grandchildren. Not up to this author's standards.