CONTENTS. 



PAGE. 



I. Nerve-Conduction in Cassiopea xamachana. By Alfred Goldsborotjgh Mayer. 



15 figures 1-20 



Methods and Corrections 3 



Experiments 9 



Summary 18 



II. The Hydrogen-ion Concentration, CO2 Tension, and CO2 Content of Sea-Water. 



By J. F. McClendon, C. C. Gault, and S. Mulholland. 24 figures 21-69 



Definitions and Abbreviations 23 



Results applied to Oceanography and Measurement of Respiration-rate of 



Marine Organisms 27 



Cahbration 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 65 



Literature List 69 



III. Variability of Eggs and Sperm of Seor-urchins. By A. J. Goldfarb 71-87 



Technique 73 



Concentration of the Germ-cells 74 



Variation in Size and Shape of Eggs 77 



Variations in Jelly Layer 78 



Variation in Membrane Formation 79 



Variation in Cleavage 80 



Correlation of the Different Variations 84 



Discussion 84 



Conclusions 86 



BibUography 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 99 



Percentage of Water 99 



Percentage of Nitrogen in Total Solids 99 



Percentage of Ash in Sohds 100 



Analysis of Different Divisions of the Body 100 



Percentage of Water 101 



Percentage of Nitrogen in the Sohds 101 



Chemical Nature of the Gelatinous Substance of Cassiopea 102 



Experiments on Starvation 103 



Analysis of the Divisions of the Starved Cassiopea 108 



Literature Cited 109 



III 



