CONTENTS OF VOLUME XXXII. 



Xo. i. JANUARY, 1917. 



PAGE 



PLOUGH, HAROLD H. Cytoplasmic Structures in the Male Germ 



Cells of Rhomaleum micropterum Beam' I 



\YILDER, INEZ \Y. On the Breeding Habits of Desmognathus fusca 13 



GOLDFARB, A.-J. The Symmetry of Grafted Eggs in Relation to 



Giant Larvce Formation in Arbacia punctulata 21 



GOLDSCHMIDT, RICHARD. On a Case of Facultative Partheno- 

 genesis in the Gypsy Moth Lymantria dispar L. With a 

 Discussion of the Relation of Parthenogenesis to Sex 3,5 



Xo. 2. FEBRUARY, 1917. 



SCHAEFFER, ASA A. Reactions of Ameba to Light and the Effect 



of Light on Feeding 45 



CHILD, C. M. Susceptibility Gradients in the Hairs of Certain 



Marine Alga 75 



ALLEE, \Y. C. The Salt Content of Natural Waters in Relation 



to Rheotaxis in Asellus . .-^. :.>.., 93 



WEESE, A. O. An Experimental Study of the Reactions of the 

 Horned Lizard, Phrynosoma modestum Gir., A Reptile of the 

 Semi-desert 98 



Xo. 3. MARCH, 1917. 



ALLEN, BENNET M. Effects of the. Extirpation of the Anterior 



Lobe of the Hypophysis of Rana pipiens 117 



LILLIE, RALPH S. Temperature- Coefficients in the Activation of 



Starfish Eggs in Butyric Acid 131 



HAMILTON, CLYDE C. The Behavior of some Soil Insects in 

 Gradients of Evaporating Power of Air, Carbon Dioxide and 

 Ammonia 159 



CHENOWETH, HOMER E. The Reactions of Certain Moist Forest 

 Mammals to Air Conditions and its Bearing on Problems of 

 Mammalian Distribution 1*3 



HARRIS, J. ARTHUR, AND LAAYRENCE, JOHN V. The Osmotic 



Concentration of (lie Sap of the Leaves of Mangrove Trees. . . . 202 



iii 



