He says page 243, "The fundamental principle involved in orientation is that it is the result . . . of the effect of illumination on life processes." Reversal in the sense of response is thought to be brought about by the effect of light on metabolic changes, and is also adaptive. The second chapter of this part (III) is devoted to reactions not orientations, or aggregations, on account of light stimulus. They are associated with foodgetting and protection. In Part IV we learn about response to colors-that "the shorter wave lengths are not the more active in all plants and animals, as has been held by others. 'Different regions of the spectrum are distinguished by honey bees, some fishes, birds and mammals, crustacæ, and probably some of the lower forms with well-developed eyes.'" In the closing chapter on "Theoretic Considerations," there is a summary of the main contentions of the book. The behavior of organisms is "adaptive and regulatory;" even purposeful," as he quotes approvingly from Jennings. In accordance with Jennings the author finds that reactions are due to change in "Physiological States," which may be due to chemical changes. This is in opposition to Loeb and others, who hold that the external stimuli directly affect (or by direct reflex) the motor mechanism. He goes a step farther than Jennings in analyzing the question, "What is it that regulates the physiological states?" While the neovitalists' views are entertained in the discussion, we are not disappointed in finding finally the same conservatism that has characterized the author's conclusions all through.. Instead of making sweeping generalizations he is content with " the distinguishing characteristics of living matter, have not as yet been accounted for mechanically." Considered from several points of view a good new book is always wel come, in whatever line it may be written. With the growth of the literature in the biological field, owing to the great number of workers and the special attention given to very narrow lines, it is difficult to keep pace even for general information. The historical account, the present bearing and future outlook are of use even to a worker in a neighboring field. The specialist in the same line will derive less from a book of this kind unless the author is an authority, or has new material which is given only in his book, as is the present case. Especially for the promulgation of theories are such special volumes valuable as they are better rounded out and substantiated by all facts that an author can command. The author has evidently made a very painstaking survey of the literature on the relations of light and organisms, and it will be a valuable source of reference for others. It is not evident why such work as Conant and Berger's monograph should not be included. The work of the publishers is done in their usual good style, though it is marred by careless final proof reading, the omission of letters in words occurring, e. g., page 236, line 19: page 238, line 9 from bottom. In the reviewer's copy pages 180 to 197 are also missing, being replaced by a duplicate of pages 165 to 181. L. MURBACH. WE COVER THE WORLD READ WHERE THIS JOURNAL GOES (SEE PAGE FACING 586) No Numbers published for July, August and September CONTENTS for JUNE, 1911 Some Suggestions to Map Publishers-Ruliff S. Holway. 487 A Most Effective Method of Discouraging Good Teaching of Physics in Secondary Schools-P. M. Dysart 493 Daytime Work in Astronomy-Sarah F. Whiting. 494 labus-Herbert E. Slaught, Chairman.. ..... A Secondary School Mathematics Club-Charles W. Newhall.... The A B C of Aëroplane Mechanics-Harvey N. Davis. Coal Lands Await Valuation Simple Demonstration of Color Mixtures-H. Teike. The Cartesian Diver-Philip Fitch... 500 509 532 541 542 543 A Simple Reflecting Galvanometer-J. M. Arthur........... 544 A Method of Carbon Dioxide Analysis-F. C. Irvin. 546 549 A Balance for Weighing One Ten Thousandth Part of a Milligramme 550 Well-Drilling Lore-U. S. Geol. Survey. 552 An Important Paint Constituent-U. S. Geol. Survey. United States Behind Other Nations in the Science of Industrial Indemnity Science Questions-Franklin T. Jones.... Real Problems in Geometry-James F. Millis.. Articles in Current Magazines Problem Department-E. L. Brown... 554 A Bibliography of Science Teaching-W. L. Eikenberry. Cement Expansion Antarctic Coal 566 567 567 567 Indiana Association of Science and Mathematics Teachers-Henry F. A. Meier 568 matics Teachers-M. R. Van Cleve..... 569 Association of Teachers of Mathematics in the Middle States and Maryland— 569 Midwinter Meeting of the Association of Mathematical Teachers in New Eng land-H. D. 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