CONTENTS 



Fi.zARD, A. Numerical law of regression of certain secondary sex 

 characters 271 



Hecht, Seug. Photochemistry of visual purple. II, The effect of 

 temperature on the bleaching of visual purple by light 285 



EcKWEiLER, Herbert, Noyes, Helen Miller, and Falk, K. George. 



The amphoteric properties of some amino-acids and peptides 291 



Coulter, Calvin B. The isoelectric point of red blood cells and its 

 relation to agglutination 309 



Zoller, Harper F., and Clark, W. Mansfield. The production 

 of volatile fatty acids by bacteria of the dysentery group 325 



Moore, A. R., and Cole, W. H. The response of Popillia japonica 



to light and the Weber-Fechner law 331 



Brooks, Matilda Moldenhauer. Comparative studies on respira- 

 tion. XIV. Antagonistic action of lanthanum as related to 

 respiration 337 



Harris, J. Arthur, Gortner, Ross Aiken, and Lawrence, John V. 

 On the differentiation of the leai tissue fluids of ligneous and her- 

 baceous plants with respect to osmotic concentration and elec- 

 trical conductivity 343 



Uhlenhuth, Eduard. Experimental production of gigantism by 

 feeding the anterior lobe of the hypophysis 347 



Hecht, Selig. Time and intensity in photosensory stimulation 367 



Hecht, Selig. The relation between the wave-length of light and its 



effect on the photosensory process 375 



Loeb, Jacques. Ion series and the physical properties of proteins. 

 III. The action of salts in low concentration 391 



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