Living Organisms 749 



Mason: Creation By Evolution, The Macmillan Co. 



Oparin: The Origin of Life, The Macmillan Co. 



Osborn: From the Greeks to Darwin, The Macmillan Co. 



Osborn: Men of the Old Stone Age, Charles Scribner's Sons. 



Osborn: Origin and Evolution of Life Upon the Earth, Charles Scribner's Sons. 



Parker: What Evolution Is, Harvard University Press. 



Shimer: Evolution and Man, Ginn and Co. 



Shull: Evolution, McGraw-Hill Book Co., Inc. 



Simpson: Tempo and Mode in Evolution, Columbia University Press. 



Waddington: How Animals Develop, W. W. Norton & Co., Inc. 



Ward: Evolution for John Doe, Bobbs-Merrill Co. 



Williams: The Human Frontier, Harcourt, Brace & Co., Inc. 



