CONTENTS. 



PAGE. 



I. Nerve-Conduction in Cassiopea xamachana. By ALFRED GOLDSBOROUGH MAYER. 



15 figures 1-20 



Methods and Corrections 



Experiments 



Summary 



II. The Hydrogen-ion Concentration, C0 2 Tension, and C0 2 Content of Sea-Water. 



By J. F. McCLENDON, C. C. GAULT, AND S. MULHOLLAND. 24 figures 21-69 



Definitions and Abbreviations 



Results applied to Oceanography and Measurement of Respiration-rate of 



^Marine Organisms 27 



Calibration of an Improved Indicator Method for use on Shipboard and in 



Poorly Equipped Laboratories 42 



New Apparatus for the Electrometric Determination of Hydrogen-ion Con- 

 centration and for Gas Analysis 48 



Historical Notes 



Literature List 69 



III. Variability of Eggs and Sperm of Sea-urchins. By A. J. GOLDFARB 71-87 



Technique 



Concentration of the Germ-cells 



Variation in Size and Shape of Eggs 77 



Variations in Jelly Layer 



Variation in Membrane Formation 79 



Variation in Cleavage 



Correlation of the Different Variations 84 



Discussion 



Conclusions 



Bibliography 87 



IV. Analytical Search for Metals in Tortugas Marine Organisms. By ALEXANDER 



H. PHILLIPS 89-93 



Method 91 



V. On the Composition of Cassiopea xamachana and the Changes in it after Starva- 



tion. By S. HATAI. 1 figure . 95-109 



Normal Growth of Different Parts of the Body 97 



Analysis of Entire Body 



Percentage of Water 



Percentage of Nitrogen in Total Solids 



Percentage of Ash in Solids 



Analysis of Different Divisions of the Body 



Percentage of Water 



Percentage of Nitrogen in the Solids 



Chemical Nature of the Gelatinous Substance of Cassiopea 



Experiments on Starvation 



Analysis of the Divisions of the Starved Cassiopea 



Literature Cited 109 



in 



