It was time to paddle my canoe into the heart of October. I must explore some winding stream decorated for my appraisal."" Thus physician and amateur naturalist Coman reports his field illuminations with a somewhat dated, gentle civility. Dr. Coman is one who, when entering the marshes or woods immediately absorbs the entire environment and its rhythms and vistas before recording his finds via photography, banding, or simply appreciation. He travels at a leisurely pace with ample time to observe small mammals, insects, birds and flora. . . . Predictably there are thoughts on how man is turning his back on his compeers and corrupting his natural origins, but the temporary gloom is rapidly exorcised by more trips in Maine, New Jersey and Delaware preserves and wilds. With an introduction by Loren Eiseley and illustrations -- a pleasant journey with a courteous companion.