CONTENTS OF VOLUME XXVI 



No. i. JANUARY, 1914. 



KANDA, SAKYO. On the Geotropism of Paru nice i inn and Spiro- 



stonunn I 



FRYING, H. E. Pure Line Inheritance and Parthenogenesis 25 



CHILD, C. M. The Axial Gradient in Ciliate Infusoria 36 



No. 2. FEBRUARY, 1914. 



CURTIS, MAYNIE R. Studies on the Physiology of Reproduction 



in the Domestic Foicl . 55 - 



GLASER, OTTO. The Change in Volume of Arbacia and Aster ias 



Eggs at Fertili:ation N4 



OKKELBERG, PETER. Volumetric Changes in the Egg of the 

 Brook Lamprey, Entosphenns (Lampetra) wilderi (Gage], after 

 Fertilization 92 



No. 3. MARCH, 1914. 



GLASGOW, HUGH. The Gastric Ca-ca and the Ccccal Bacteria of 



the Ileteroptera 101 



BANTA, ARTHUR M. Sex Recognition and the Mating Behavior of 



the Wood Frog, Ran a sylvatica 171 



WHITING, PHINEAS \V. Observations on Blow Flics; Duration of 



the Pi'cpnpa! Stage and Color Determination 184 



No. 4. APRIL, 1914. 



MORGAN, T. H. No Crossing over in the Male of Drosophila of 



Genes in the Second and Third Pairs of Chromosomes 195 



BRIDGES, C. B., AND STURTEVANT, A. II. .4 New Gene in the 

 Second Chromosome of Drosophila and some Considerations 

 on Differential Viability 3*5 



MORGAN, T. H., AND TiCE, S. C. The Influence of the Environ- 

 ment on the Size of Expected Classes 213 



TICE, SABRA COLBY. A New Sex-linked Character in Drosophila 221 



MORGAN, T. H. Another Case of Multiple Allelomorphs in Droso- 

 phila 231 



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