DREAMS HAVE their own logic, in the world that Robert Zend explores in Daymares (CACANADADADA Press, 183 pages, $12.95 paper). In this posthumous collection of stories, poems, and sketches Zend, who died in 1985, displays his fascination with dreams as creative outlets; as the place where our concealed mental life bursts through each night while we sleep. These stories have some of the elements common to dreams - abrupt shifts in time and place, and unlikely juxtapositions of people and events. However, Zend tailors his headlong flow of words and images to give the stories a force and direction normally lacking in dreams. Zend was an unabashedly intelligent writer who could turn his talents to farce, as in "The End of the World," or to an inverted fable like `Antihistory," which recounts the great non-events of history. There`s also a brilliant and argumentative introduction to an unpublished manuscript called "Selected Dreams," which is one of the best pieces in the collection. Perhaps the most remarkable inclusion is the story titled "Magellan`s Tombstone," which is a reworking of the legend of the explorer Ferdinand Magellan; it is a rich and absorbing concoction of mythology, popular archaeology and science fiction.