CONTENTS 



I. On the Production and Suppeession of Muscular Twitchings and 



Hypersensitiveness op the Skin by Electrolytes - - - 1 



By Jacques Loeb, Professor and Head of the Department of Physi- 

 ology 



II. On a Formula for Determining the Weight of the Central Ner- 

 vous System of the Frog from the Weight and Length of 

 its Entire Body - - - - - - - . -15 



By Henry H. Donaldson, Professor and Head of the Department of 

 Neurology 



III. The Development of the Colors and Color Patterns of Coleop- 



TERA, WITH Observations upon the Development of Color in 

 Other Orders of Insects (with Plates I-III) . - . 31 



By William Lawrence Tower, Assistant in Embryology 



IV. The Artificial Production of Spores in Monas by a Keduction 



OF THE Temperature - - - - - - --71 



By Arthur W. Greeley, Assistant in Physiology 



V. The Self-Purification of Streams .-_-_- 79 



By Edwin Cakes Jordan, Associate Professor of Bacteriology 



VI. The Lecithans: Their Function in the Life of the Cell - 91 



By Waldemar Koch, Assistant in Pharmacology 



VII. A Contribution to the Physical Analysis of the Phenomena of 



Absorption of Liquids by Animal Tissues - - - - 103 

 By Ralph Waldo Webster, Assistant in Physiological Chemistry 



VIII. The Distribution of Blood-Vessels in the Labyrinth of the Ear 



OF Sus Scrofa Domesticus (with Plates V-XII) _ _ - 135 



By George E. Shambaugh, Instructor in Anatomy of the Ear, Nose, 

 and Throat 



ix 



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