CONTENTS 



OsTERHOUT, W. J. V. Conductivity and permeability 1 



Maxwell, S. S. ^Stereotropic reactions of the shovel-nosed ray, 



Rhinobatus productus 11 



Maxwell, S. S. The stereotropism of the dogfish {Mustelus cali- 

 fornicus) and its reversal through change of intensity of the 

 stimulus 19 



Moore, A. R. Chemical stimulation of the nerve cord of Lumbricus 



terrestris 29 



Chambers, Robert. The formation of the aster in artificial par- 

 thenogenesis 33 



Chambers, Robert. Studies on the organization of the starfish egg. 41 



Mitchell, Phillp H., and Wilson, J. Walter. The selective absorp- 

 tion of potassium by animal cells. I. Conditions controlling 

 absorption and retention of potassium 45 



Northrop, John H. Comparative hydrolysis of gelatin by pepsin, 



trypsin, acid, and alkaH 57 



LoEB, Jacques. Donnan equilibrium and the physical properties of 



proteins. IV. Viscosity — continued 73 



Loeb, Jacques. The reciprocal relation between the osmotic pressure 



and the viscosity of gelatin solutions 97 



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