The biographer of Columbus, the recorder of our naval history, Morison now turns to a labor of love in a ""biography"" of Mt. Desert Island. He yields the palm to Richard W. Hale, Jr. for his Story of Bar Harbour and the recent part of its history. But on the earliest inhabitants- the Indians, the European discoveries and earliest colonists, the permanent settlers and the mark they have left on today's residents, the later day summer-colony interests, and the tourists-- Morison writes with informed perspicacity and loving appreciation, even of the foibles. He has been almost a lifelong part-time resident; he knows every part of the island; he relishes the legends and the folk ways; he has taken part in the activities; and he shares all this vividly, intimately, with his readers. These will be largely drawn from those who have known Mt. Desert-and for that extraordinarily large number of people to whom any book on Maine is a must book. To this could be added the yachting fraternity, for quite naturally, Morison's interests embrace the lively enthusiasm of the summer colony for boating.