CONTENTS 



1911 

 No. 1. JANUARY 



G. H. Parker. The olfactory reactions of the common killifish, Fundulus 



heteroclitus (Linn.) 1 



Sergiu.s Morgulis. Contributions to the physiology of regeneration. III. 



Further experiments on Poclarke Obscura 7 



Georp.ina B. Spooner. Embryological studies with the centrifuge. Thir- 

 teen figures 23 



Ralph E. Sheldon. The sense of smell in Selachians 51 



Montrose T. Burrows. The growth of tissues of the chick embryo outside 

 the animal body, with special reference to the nervous system. Fourteen 

 figures 63 



Marian L. Shorey. A study of the differentiation of neuroblasts in artificial 



culture media. Ten figures So 



No. 2. FEBRUARY 



Gary N. Calkins. Regeneration ana cell division in T^ronychia. Fifteen 



figures 95 



A. Franklin Skull. Studies in the life cycle of Hydatina senta. II. The 

 role of temperature, of the chemical composition of the medium, and of 

 internal factors upon the ratio of parthenogenetic to sexual forms 117 



William Brodbeck Herms. The photic reactions of sarcophagid flies, espe- 

 cially Lucilia caesar Linn, and Calliphora vomitoria Linn. Twenty-five 

 figures 167 



Mary O. McGinnis. Reactions of Branchipus serratus to light, heat and 



gravity 227 



