CONTENTS OF VOLUME XXIII. 



No. i. JUNE, 1912. 



CHILD, C. M. The Process of Reproduction in Organisms I 



DEDERER, PAULINE H. Preliminary Note on Gameto gene sis in 



Philosamia cynthia 40 



KEPNER, WM. A., AND TALIAFERRO, W. H. Sensory Epithelium 



of Pharynx and Ciliated Pits of Microstoma caudatum 42 



No. 2. JULY, 1912. 



SHELFORD, VICTOR E. Ecological Succession. IV. Vegetation and 



the Control of Land Animal Communities 59 



NEWMAN, H. H. The Ovum of the Nine-banded Armadillo. 



Growth of the Ovocytes, Maturation and Fertilization 100 



No. 3. AUGUST, 1912. 



BORING, ALICE M. The Interstitial Cells and the Supposed 



Internal Secretion of the Chicken Testis 141 



PEEBLES, FLORENCE. Regeneration and Regulation in Para- 



mecium caudatum 154 



JACKSON, C. M. On the Recognition of Sex Through External 



Characters in the Young Rat 171 



MORGAN, T. H., AND LYNCH, CLARA J. The Linkage of Tivo 



Factors -in Drosophila that are not Sex-linked 174 



DEXTER, JOHN S. On Coupling of Certain Sex-linked Characters 



in Drosophila 183 



WATTERS, FLORENCE A. Size Relationships between Conjugants 



and Non-conjiigants in Blepharisma undulans 195 



No. 4. SEPTEMBER, 1912. 



GLASER, R. W. A Contribution to Our Knowledge of the Function 



of the CEnocytes of Insects 213 



HARVEY, B. C. H., AND BENSLEY, R. R. Upon the Formation of 

 Hydrochloric Acid in the Foveolcs and on the Surface of the 

 Gastric Mucous Membrane and the Non-acid Character of 



the Contents of Gland Cells and Lumina 225 



iii 



