Baker's dozen of science fiction tales which are grouped according to various departments of science -- biology, mathematics, the social sciences, psychiatry, etc. -- and with an introduction for each section. Among those present -- Bradbury, de Camp, Neville, Sturgeon for the once in a while followers, and Rocklynne, Latham, Gallien, Phillips and others for the avid adherent. Dreams, society the ally of time, linguistics as a bridge, Paradise -- lost and won, the uses of non-identity, Venusian systems, the loss of light, a Mars man making the earth, the recreation of prehistoric animals; the ingredients differ a bit here from previous collections -- and add their bit to these strange new worlds. Able editing.