First edition of the Penrose Memorial Lecture for 1962, given before the American Philosophical Society. Blue cloth in dustjacket. Illustrated with numerous sketches, drawings and photographs. “Dr. Murphy, chosing some of Whitman’s lines as an introduction to his lecture, gives, in prose worthy to follow the poet’s verse, a scientist’s precise account of the land and its inhabitants, tinged with nostalgia for bygone days and vanished creatures, yet filled with a joyful sense of the timeless beauty of earth and living things.” Fine in very good dustjacket.