[21] The Wilderness of Worlds. A Popular Sketch of the Evolution of Matter from Nebula to Man and Return. The Life-Orbit of a Star. By George W. Morehouse. New York: Peter Eckler. Pp. 246. Price, $1. In a volume entitled _The Living Organism_[22] Mr. _Alfred Earl_ has endeavored to make a philosophical introduction to the study of biology. The closing paragraph of his preface is of interest as showing his views regarding vitalism: "The object of the book will be attained if it succeeds, although it may be chiefly by negative criticism, in directing attention to the important truth that, though chemical and physical changes enter largely into the composition of vital activity, there is much in the living organism that is outside the range of these operations." The first three chapters discuss general conceptions, and are chiefly psychology. A discussion of the structures accessory to alimentation in man and the higher animals occupies Chapters IV and V. The Object of Classification, Certain General Statements concerning Organisms, A Description of the Organism as related to its Surroundings, The Material Basis of Life, The Organism as a Chemical Aggregate and as a Center for the Transformation of Energy, Certain Aspects of Form and Development, The Meaning of Sensation, and, finally, Some of the Problems presented by the Organism, are the remaining chapter headings. The volume contains many interesting suggestions, and might perhaps most appropriately be described as a Theoretical Biology. [22] The Living Organism. By Alfred Earl, M. A. New York: The Macmillan Company. Pp. 271. Price, $1.75.