CONTENTS OF VOLUME XXVIII. 



No. I. January, 1915. 



Just, E. E. Initiation of Development in Nereis i 



LiLLiE, Frank R. Sperm Agglutination and Fertilization. ..... 18 



WiEMAN, H. L. Observations on the Spermatogenesis of the Gall- 



Fly, Dryophanta erinacei (Mayr) 34 



SwEZY, Olive. Egg Albumen as a Culture Medium for Chick 



Tissue 47 



Werber, E. I. The Influence of Products of Pathologic Meta- 

 bolism on the Developing Teleost Ovum 51 



No. 2. February, 1915. 



LoEB, Leo. An Early Stage of an Experimentally Produced 

 Intratiterine Pregnancy and the Spontaneous Parthenogenesis 

 of the Eggs in the Ovary of the Guinea Pig 59^ 



Garrey, Walter E. Some Cryoscopic and Osmotic Data 77 



LoEB, Jacques. Concerjiing Brachet's Ideas of the Role of Mem- 

 brane Formation in Fertilization 87 



Just, E. E. An Experimental Analysis of Fert-ilization in Platy- 



nereis megalops 93 



Linton, Edwin. Sporocysts in an Anyielid 115 



No. 3. March, 1915. 

 Sutherland, G. F. Nuclear Changes in the Regenerating Spinal 



Cord of the Tadpole of Rana clamitans 119 



Richards, A., and Woodward, A. E. Note on the Effect of X- 



Radiation on Fertilizin 140 



Glaser, Otto. Can a Single Spermatozoon Initiate Development 



in Arbacia? 14^ 



Curtis, Maynie R. Studies on the Physiology of Reproduction 



in the Domestic Fowl. XII 154 



No. 4. April, 1915. 

 WooLSEY, Carrie L Linkage of Chromosomes Correlated with 

 Reduction in Numbers Among the Species of a Genus, also 



Within a Species of the Locustidce 163 



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