CAN YOU TOP THIS?

Radio skit into book -- always a gamble. But the extraordinary popularity of Hennett Cerf's two ventures into joke books makes one realize the potential market. Here are jokes on a lower level -- ""Clown Table"" discussion of three famous wits. There are ""thumbnose"" sketches of the principals; there are brief warm up stories; there are the cream of the jog in their top notchers, checked by the Laugh Meter scores; and there are dialogues, on moot subjects.