No. 3.— August, 1905. 

 N. M. Stevens, 



A Study of the Genn Cells of Aphis Rosse and Aphis (Enotherte. With 4 

 plates 313 



N. M. Stevens and A. M. Boring, 



Regeneration in Polychcerus Caudatus. Part I. Oljservations on Living 



Material. By N. M. Stevens. With 21 figures 335 



Part II. Histology. By A. M. Boring. With 2 plates and 1 figure in the 

 text 340 



Charles Zeleny, 



The Relation of the Degree of Injury to the Rate of Regeneration. With 

 6 figures 347 



1 Edmund B. Wilson, 



Studies on Chromosomes. I. The Behavior of the Idiochromosomes in 

 Hemiptera. With 7 figures 371 



G. H. Parker, 



The Movements of the Swimming Plates in Ctenophores, with Reference to 

 the Theories of Ciliary Metachronism. With 2 figures 407 



Henry Edward Crampton, 



On a General Theory of Adaptation and Selection 425 



Warren Harmon Lewis, 



Experimental Studies on the Development of the Eye in Amphibia. II. On 

 the Cornea. With 2 plates 431 



No. 4. — November, 1905. 

 H, S. Jennings, 



Modifiability in Behavior. I. Behavior of Sea Anemones 447 



H. S. Jennings, 



The Method of Regulation in Behavior and in Other Fields 473 



T. H. Morgan, 



"Polarity" Considered as a Phenomenon of Gradation of Materials 495 



^ Edmund B. Wilson, 



Studies on Chromosomes. II. The Paired Microchromosomes, Idiochro- 

 mosomes and Heterotropic Chromosomes in Hemiptera 507 



Chas. W. Hargitt, 



Variations Among Scyphomedusse. With 1 plate and 17 figures in the 

 text 547 



LoRANDE Loss Woodruff, 



An Experimental Study on the Life-History of Hypotrichous Infusoria. 

 With 3 plates and 12 figures in the text 585 



