CONTENTS 



No. 1. AUGUST 



E. R. HosKiNs AND M. M. HosKiNS. Growth and development of Amphibia 

 as affected by thyroidectomy. Nine plates (one hundred and nine 

 figures) 1 



Helen Dean King. Studies on inbreeding. IV. A further study of the 

 effects of inbreeding on the growth and variability in the body weight of 

 the albino rat. Eight charts 71 



Harley N. Gould. Studies on sex in the hermaphrodite mollusc Crepidula 

 plana. III. Transference of the male-producing stimulus through sea- 

 water. One text figure 113 



No. 2. OCTOBER 



Gart N. Calkins. Uroleptus mobilis engelm. II. Renewal of vitality 



through conjugation. One chart and one figure 121 



Leslie B. Arey and W. J. Crozier. The sensory responses of Chiton. 



Fourteen figures 157 



W. J. Crozier and Leslie B. Arey. Sensory reactions of Chromodoris 



zebra. Eight figures 261 



Matstjziro Takenouchi. Studies on the reputed endocrine function of the 



thymus gland (albino rat). Two charts 311 



No. 3. NOVEMBER 



DwiGHT E. MiNNiCH. The photic reactions of the honey-bee, Apis melli- 

 fera L. Seventeen figures 343 



Robert W. Hegner. The effects of environmental factors upon the herit- 

 able characteristics of Arcella dentata and A. polypora. Seven figures. . . 427 



M. E. CoLLETT. The toxicity of acids to ciliate Infusoria. Six graphs.. . . 443 



J. A. Dawson. An experimental study of an amicronucleate Oxytricha. 

 I. Study of the normal animal, with an account of cannibalism. Twenty 

 figures 473 



