Another fighter in the cause of conservation, Professor Errington, once a trapper and now a biologist, makes his plea for the wetlands now being lost primarily through artificial drainage. His specific areas are those marshes occurring over the glaciated prairies of northern central United States and adjacent Canada and he emphasizes the continuities of time that they represent, follows the seasonal cycle from spring through winter with the wild life that inhabits them and makes a telling point when he compares the laws of life that the inhabitants embody with mankind's societies. He travels further to marshes in the South and the Far West; he writes of the islands in the marshes, of exploring them with safety and comfort, of the peace and harmony that observation and study of them can bring and he argues how man can make harmonious use of them. Memories and experiences of his own are full of contended adventuring in natural history and his tales of life and death in these spontaneous wildernesses are specialized reporting. Very much an outdoor type of book in spite of its definite crusading.