CONTENTS 



1913 



No. 1 JANUARY 20 



Leon J. Cole. Direction of locomotion of the starfish (Asterias forbesi). . . 1 

 T. H. Morgan and Eleth Cattell. Additional data for the study of sex- 

 linked inheritance in Drosophila 33 



A. H. Sturtevant. The linear arrangement of six sex-linked factors in 



Drosophila, as shown by their mode of association 43 



Ethel Nicholson Browne. A study of the male germ cells in Notonecta. .. . 61 

 L. B. Nice. Studies on the effects of alcohol, nicotine and caffeine on white 



mice. II. Effects on activity 123 



No. 2 FEBRUARY 20 



C. M. Child. Studies on the dynamics of morphogenesis and inheritance 

 in experimental reproduction. V. The relation between resistance to 

 depressing agents and rate of metabolism in Planaria dorotocephala and 



its value as a method of investigation 153 



i-^V. E. Shelford and W. C. Allee. The reactions of fishes to. gradients 



of dissolved atmospheric gases 207 



.Jacoues Loeb and F. W. Bancroft. The sex of a parthenogenetic tadpole 

 and frog 267 



Frank D. Lutz. Experiments concerning the sexual difference in the 

 wing length of Drosophila ampelophial 271 



No. 3 APRIL 5 



H. S. Jennings. Theeffectof conjugation in Paramecium. Two figures 279 



Vi^uH. S. Jennings and K. S. Lashley. Biparental inheritance and the ques- 

 tion of sexuality in Paramecium. Two figures 393 



No. 4 MAY 20 



Alfred O. Gross. The reactions of arthropods to monochromatic lights 



of equal intensities. Forty-five figures 467 



V Frank R. LiLLiE. Studies of fertilization. V. The behavior of the sperma- 

 tozoa of Nereis and Arbacia with special reference to egg-extractives. 



Five figures .515 



Lorande Loss Woodruff. The effect of excretion products of Infusoria 

 on the same and on different species, with special reference to the proto- 

 zoan sequence in infusions 575 



