Four short stories are the latest addition to the undistinguished, revived (these yarns date from paperbacks in 1959) Rim Worlds series. ""The Man Who Could Not Stop"" is one of Chandler's better efforts: habitual criminal Clavering, given a last chance to reform, fails to break a lifetime's compulsion and is inducted into the crew of the first intergalactic exploration vessel. The other three entries are more or less standard pulp. A hard-up ship's master (also, confusingly, called Clavering) discovers an Earthlike oasis on a poisonous, volcanic world--and turns it into a tourist attraction. Some cave-painting primitives accidentally time-jump into the present (they use sympathetic magic to draw a team of investigators). And the rich inventor of a free-fall toilet searches for the secret of the universe. . . as it turns out that our universe is the cosmic sewer of a higher dimension. A meager--and, except for that one story, mediocre--Rim World installment.