IT is not given to many of us to wander through the waste places of the earth, and too often the explorer leaves no written record of his experiences. Mr. Up de Graff led an adventurous life in the region drained by the extreme head waters of the Amazon, and he was a keen observer of all that passed on around him. As he says, he is not a trained naturalist and the deductions he draws from some of his observations may be questioned by men whose life work is natural history, but any such criticisms do not detract from the value of the work. Anyone who has tried it out knows that three equally...