CHEMICAL BASIS OF GROWTH By T. B. ROBERTSON, University of Toronto COÖRDINATION IN LOCOMOTION By A. R. MOORE, Rutgers College OTHERS WILL FOLLOW * * * * * Monographs on Experimental Biology THE NATURE OF ANIMAL LIGHT BY E. NEWTON HARVEY, Ph.D. PROFESSOR OF PHYSIOLOGY, PRINCETON UNIVERSITY [Illustration] PHILADELPHIA AND LONDON J. B. LIPPINCOTT COMPANY COPYRIGHT, 1920. BY J. B. LIPPINCOTT COMPANY _Electrotyped and Printed by J. B. Lippincott Company. The Washington Square Press, Philadelphia, U. S. A._ EDITORS' ANNOUNCEMENT The rapid increase of specialization makes it impossible for one author to cover satisfactorily the whole field of modern Biology. This situation, which exists in all the sciences, has induced English authors to issue series of monographs in Biochemistry, Physiology, and Physics. A number of American biologists have decided to provide the same opportunity for the study of Experimental Biology. Biology, which not long ago was purely descriptive and speculative, has begun to adopt the methods of the exact sciences, recognizing that for permanent progress not only experiments are required but quantitative experiments. It will be the purpose of this series of monographs to emphasize and further as much as possible this development of Biology. Experimental Biology and General Physiology are one and the same science, in method as well as content, since both aim at explaining life from the physico-chemical constitution of living matter. The series of monographs on Experimental Biology will therefore include the field of traditional General Physiology. JACQUES LOEB, T. H. MORGAN, W. J. V. OSTERHOUT. PREFACE Bioluminescence, the production of light by animals and plants, has always excited the admiration of the layman and the wonder of the scientist. It is not surprising that an enormous literature dealing with the subject has grown up. A large part of this literature, however, is made up merely of reports that a certain animal is luminous, or records of especially brilliant phosphorescence of the sea. Among those who have inquired somewhat more carefully into the nature and causes of light production may be mentioned the names of Beijerinck, R. Boyle, Dahlgren, Dubois, Ehrenberg, Krukenberg, Mangold, McDermott, Molisch, Panceri, Pflüger, Phipson, Quatrefages, Spallanzani, and Trojan. Several of these men have written comprehensive monographs on the subject.