IV CONTENTS OF VOLUME XXIII. 



WESCHE, W. The Phylogeny of the Nemocera, with Notes on the 



Leg Bristles, Hairs and Certain Mouth Glands of Diptera. . . 250 



No. 5. OCTOBER, 1912. 



PATTERSON, J. T., AND WIEMAN, H. L. The Uterine Spindle of 



the Polyclad Planocera inquilina 271 



STRONG, R. M. Results of Hybridizing Ring-Doves, Including 



Sex-linked Inheritance 293 



WHITNEY, D. D. Weak Partheno genetic Races of Hydatina senta 



Subjected to a Varied Environment 321 



No. 6. NOVEMBER, 1912. 



SHELFORD, VICTOR E. Ecological Succession. V. Aspects of 



Physiological Classification 331 



TURNER, C. H. An Experimental Investigation of an Apparent 

 Reversal of the Responses to Light of the Roach (Periplaneta 

 orientalis L.) 371 



