IV CONTENTS. 



GREGORY, LOUISE H. The Effect of Starvation on the Wing De- 

 velopment of Microsiphum destructor 296 



No. 5. NOVEMBER, 1917 



WHITNEY, D. D. The Production of Functional and Rudimentary 



Spermatozoa in Rotifers 305 



PORTER, LELIA T. The Spermatocytic Divisions of Leptocoris htz- 



matoloma 316 



CHARLTON, HARRY H. The Fate of the Unfertilized Egg in the 



White Mouse 321 



WEBER, ROXIE A. Observations on the Structure of Double Mon- 

 sters in the Earthworm 339 



WOODWARD, ALVALYN E., AND HAGUE, FLORENCE S. Iodine as a 



Partheno genetic Agent 355 



No. 6. DECEMBER, 1917. 



MAY, H. G. Selection for Higher and Lower Facet Numbers in the 

 Bar-eyed Race of Drosophila and the Appearance of Reverse 



Mutations 361 



CONKLIN, EDWIN E. Mitosis and Amitosis. . .* 396 



WOODRUFF, LORANDE Loss. The Influence of General- Environ- 

 mental Conditions on the Periodicity of Endomixis in Para- 

 mecium aurdia 437 



