CONTENTS 



1913 



No. 1 JULY 5 



LoRANDE Loss WooDRUFF. Cell size, nuclear size and the nucleo-cytoplas- 

 mic relation during the life of a pedigreed race of Oxytricha fallax. One 

 figure 



1 



Ralph S. LiLLiE. The physiology of cell-division. V. Substitution of anes- 

 thetics for hypertonic sea water and cyanide in artificial parthenogenesis 

 in starfish eggs 23 



A. Franklin Shull. Inheritance of egg characters and of the sex ratio 

 in Hydatina senta. Two figures 49 



Claude W. Mitchell. Experimentally induced transitions in the morpho- 

 logical characters of Asplanchna amphora Hudson, together with re- 

 marks on sexual reproduction. Three charts 91 



Robert H. Hutchison. Some specific differences among Protozoa with 

 respect to their resistance to heat. Two figures 131 



No. 2 AUGUST 20 



H. H. Newman. The modes of inheritance of aggregates of meristic (inte- 

 gral) variates in the polyembryonic offspring of the nine-banded arma- 

 dillo 145 



s/ H. S. Jennings and K. S. Lashley. Biparental inheritance of size in Para- 

 mecium 193 



Jacques Loeb. Further experiments on natural death and prolongation of 

 life in the egg 201 



Ruth Wheeler. Feeding experiments with mice. Six charts 209 



Claude W. Mitchell. Sex-determination in Asplanchna amphoi-a 225 



iii 



