CONTENTS. 



No. 1.— May, 1904. 

 Edmund B. Wilson, 



Experimental Studies on Germinal Localization. I The Germ Regions 

 in the Egg of Dentalium. With 100 figures 1 



Charles W. Hargitt, 



Regeneration in Rhizostoma Pulmo. With 6 figures 73 



C. M. Child, 



Studies on Regulation. IV. Some Experimental Modifications of Form- 

 Regulation in Leptoplana. With 53 figures 95 



T. H. Morgan, 



Self-Fertilization Induced by Artificial Means .• 135 



John Bruce MacC.\llum, 



The Influence of Calcium and Barium on the Secretory Activity of the 

 Kidney 179 



Charles Russell Bardeen and F. H. Baetjer, 



The Inhibitive Action of the Rontgen Rays on Regeneration in Planarians . . 191 



No. 2.— August, 1904. 

 Edmund B. Wilson, 



Experimental Studies on Germinal Localization. II. Experiments on the 

 Cleavage-Mosaic in Patella and Dentalium. With 118 figures 197 



A. J. Carlson, 



Contributions to the Physiology of the Ventral Nerve Cord of Myriapoda 

 (Centipedes and Millipedes). With 6 figures 269 



Frank W. Bancroft, 



Note on the Galvanotropic Reactions of the Medusa Polyorchis penicillata, 

 A. Agassiz. With 4 figures 289 



Charles Zeleny, 



Experiments on the Localization of Developmental Factors in the Nemer- 

 tine Egg. With 19 figures 293 



T. H. Morgan and Abigail C. Dimon, 



An Examination of the Problems of Physiological "Polarity "and Electrical 

 Polarity in the Earthworm 331 



Abigail C. Dimon, 



The Regeneration of a Heteromorphic Tail in Allolobophora fcetida 349 



