CONTENTS OF VOLUME XXXVII. 



No. i. JULY, 1919. 

 BRUES, CHARLES T. The Classification of Insects on the 



Character of the Larva and Pupa I 



FLATHER, MARY DRUSILLA. The Influence of Glandular 



Extracts upon the Contractile Vacuoles of Paramecium 



caudatum 22 



BYRNES, ESTHER F. Experiments in Breeding as a Means 



of Determining some Relationships among Cyclops 40 



No. 2. AUGUST, 1919. 



GREEN, WYMAN REED. Studies in the Life Cycle of Simo- 



cephalus vetulus 49 



HARVEY, ETHEL BROWNE. Nilotic Division of Binucleate 



Cells 96 



CHILD, C. M. The Axial Gradients in Hydrozoa, II 101 



COPELAND, MANTON. Locomotion in Two Species of the 

 Gastropod Genus Alectrion with Observations on the 

 Behavior of Pedal Cilia 126 



No. 3. SEPTEMBER, 1919. 



GUTHRIE, M. J., AND HiBBARD, H. Cleavage and Mesen- 



chyme Formation in Toxopneustes variegatus 139 



MOORE, E. LUCILE. The Effect of Adrenin upon the Rate of 



Locomotion of Planar la and of Toad Larvce 157 



SEYSTER, E. W. Eye Facet Number as Influenced by Tem- 

 perature in the Bareyed Mutant of Drosophila melano- 

 gaster (Ampelophild) 168 



KRECKER, F. H. Circulation of the Ccelomic Fluid in a 



Nematode 183 



BUDINGTON, R. A. Influence of Certain Ductless Gland Sub- 

 stances on the Growth of Plant Tissues 188 



TANNREUTHER, G. W. Studies on the Rotifer Asplanchnia 



ebbesbornii, with Special Reference to the Male 194 



iii 



