CONTENTS 



No. 1. OCTOBER, 1918 



Helen Dean King. Studies on inbreeding. III. The effects of inbreeding, 

 with selection, on the sex ratio of the albino rat. One figure 1 



Shinichi Matsumoto. Demonstration of epithelial movement by the use 

 of vital staining, with observations on phagocytosis in the corneal epithe- 

 lium. Four figures 37 



William B. Kirkham. Observations on the relation between suckling and 



the rate of embryonic development in mice 49 



Peter Schmidt. Anabiosis of the earthworms 57 



H. H. Collins. Studies of normal moult and of artificially induced regen- 

 eration of pelage in Peromyscus. Fifteen figures 73 



No. 2. NOVEMBER, 1918 



E. R. HosKiNS AND M. M. HosKiNS. The reaction of Selachii to injections of 

 various non-toxic solutions and suspensions (including vital dyes), and 

 to excretory toxins. Twenty-seven figures (six plates) 101 



Elmer Roberts. Fluctuations in a recessive Mendelian character and 



selection. Two plates and three text-figures 157 



Charles Harlan Abbott. Reactions of land isopods to light. Fourteen 



figures 193 



W. J. Crozier. Assortive mating in a nudibranch Chromodoris zebra 



Heilprin. Twenty-three figures and charts 247 



No. 3. JANUARY, 1919 



Gary N. Calkins. Uroleptus mobilis, Engclm. I. History of the nuclei 



during division and conjugation. Ninety-five text figures 293 



W. J. Crozier. On the use of the foot in some moUusks. One figure 359 



S. O. Mast. Reversion in the sense of orientation to light in the colonial 



forms, Volvox globator and' Pandorina morum. Two figures 367 



Andrew Johnson Bigney. The effect of adrenin on the pigment migration 

 in the inelanophores of the skin and in the pigment cells of the retina of 

 the frog 391 



W. W. Swingle. Studies on the relation of iodin to the thyroid. I. The 



effects of feeding iodin to normal and thyroidectomized tadpoles 397 



\V. \V. Swingle. Studies on the relation of iodin to the thyroid. II. Com- 

 parison of the thyroid glands of iodin-fed and normal frog larvae 417 



M. H. Jacobs. Acclimatization as a factor affecting the upper thermal doatli 



l)oints of organisms 427 



iii 



