CONTENTS 



Crozier, W. J. Intracellular acidity in Valonia 581 



Crozier, W. J. On the control of the response to shading in the 

 branchiae of Chromodoris 585 



Swingle, W. W. Iodine and the thyroid. III. The specific action 



of iodine in accelerating amphibian metamorphosis 593 



Northrop, J. H. The effect of various acids on the digestion of pro- 

 teins by pepsin 607 



Moore, A. R. The respiratory rate of the sciatic nerve of the frog 

 in rest and activity 613 



Fred, E. B. The growth of higher plants in soils free of micro- 

 organisms 623 



Fred, E. B., and Haas, A. R. C. The etching of marble by roots in 



the presence and absence of bacteria 631 



Morgan, T. H., and Bridges, Calvin B. The inheritance of a fluc- 

 tuating character 639 



Bridges, Calvin B. Vermilion-deficiency 645 



HiiCHT, Selig. The nature of the latent period in the ph'^tic re- 

 sponse of Mya arenaria - 657 



Hecht, Selig. The effect of temperature on the latent period in 



the photic response of Mya arenaria ^, 667 



Loeb, Jacques. The physiological basis of morphological polarity 



in regeneration. II 687 



Loeb, Jacques. The influence of electrolytes on the electrification 



and the rate of diffusion of water through collodion membranes . 717 



Index to Volume 1 747 



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