JV CONTENTS OF VOLUME XLIII. 



No. 4. OCTOBER, 1922. 



CROZIER, YV. J. "Reversal of Inhibition" by Atropine in 



Caterpillars 239 



SNYDER, L. H., AND CROZIER, W. J. Notes on Some Prob- 

 lems of Adaptation: p. Ctenidial Variation in Chiton. . . . 246 



METZ, C. W. Chromosome Studies on the Diptcra. IV. 

 Incomplete Synopsis of Chromosomes in Dasyllis grossa 

 Fa.br 253 



SAMPSON, M. M. Iso-agglutination and Hetero-agglutination 



of Spermatozoa 267 



MOORE, C. R. On the Physiological Properties of the Gonads 

 as Controllers of Somatic and Psychical Characteristics. 

 V .'285 



No. 5. NOVEMBER, 1922. 



HYMAN, L. H., AND BELLAMY, A. W. Studies on the Corre- 

 lation Between Metabolic Gradients, Electrical Gradients, 

 and Galvanotaxis. 1 313 



RICHARDS, A. The Acceleration of the Rate of Cell Division. 348 



No. 6. DECEMBER, 1922. 



METZ, C. W. Association of Homologous Clironiosonies in 



Tetraploid Cells of Diptera 369 



PARKER, G. H. The Geotropism of the Sea-urchin Cen- 



trcchinus 374 



JUST, E. E. Initiation of Development in the Egg of Ar- 



bacia, I. Effect of Hypertonic Sea-water in Producing 

 Membrane Separation, Cleavage, and Top-swimming 

 Plutei 384 



JUST, E. E. Initiation of Development in the Egg of Ar- 

 bacia, II. Fertilisation of Eggs in Various Stages of 

 Artificially Induced Mitosis 401 



JUST, E. E. Initiation of Development in the Egg of Ar- 

 bacia, III. The Effect of Arbacia Blood on the Ferti- 

 lization Reaction 4 1 1 



