Vlll CONTENTS. 



SUMMARY OF CURRENT RESEARCHES. 



ZOOLOGY. 



VERTEBRATA. 

 «• Embryology- 



PAGK 



Parker, G. H. — Sex-determination in Pigs id 



Parker, G. H., & C. Bullard — Litters and Nipples in Swine 1 < * 



Herlant, M. — Experimental Parthenogenesis in Sea-urchins 11 



Hegner, Robert W. — Studies on Germ-cells II 



Goette, A. — Development of Nerves of the Head in Fishes and Amphibians .. .. [3 



Neal, H. V. — Eye-muscle Nerves 14 



Billiard, G. — Regenerative Capacity of Lizards 16 



Orton. J. H. — Hermaphrodite Amphioxus .. .. " " 16 



Doncaster, L. — Determination of Sex 123 



Grosser, O. — Age of Human Embryo 12.~> 



Pearl, R., & F. M. Surface — Effect of Corpus Luttum Substance on Ovulation in 



Fowl 12.". 



„ „ „ Egg-production in the Domestic Fowl 126 



Makuschok, M. — Development and Evolution of Lungs 127 



Pearl, Raymond, & Alice M. Boring — Development of Feathers 127 



Alten. H. v. — Visceral Clefts in Chelonians J 28 



Pearl, R. — Brooding Instinct in the Domestic Fowl 128 



Chidester, F. E. — Abnormal Hen's Egg 129 



Banta, A. M., & R. A. Gortner — Milky-white Jell in' Axolotl Spawn 129 



„ „ „ Accessory Appendages in Amphibian Larva . . 1 29 



Jennings, H. S. — Inbreeding 180 



Pearl, Raymond — Inbreeding 1 30 



Warren, Ernest — Hybridism, between Cockatoos 131 



Gunther & Paula Hertwig — Hybridization Experiments on Fishes 131 



Bates, George A. — Development of Pronephric Duet in Elasmobranchs .. .. lol 



Gortner, R. A., & A. M. Banta — Experiments on Amphibian ra 182 



Pearl, Raymond, & R. N. Salaman — Sex Ratio among Jews 132 



Loeb, Jacques — Artificial Parthenogenesis and Fertilization 2:;2 



Gortner, R. A. — Chemistry of Development 234 



Banta, A. M., & R. A. Gortner — Centrifuging Eggs of Wood Frog 235 



Hart, D. Berry— Typical Sex-ensemble in Mammals 235 



Banta, A. M. — Inhibition of Pigment 236 



Hart, D. Berry — Hermaphroditism and Pseudo- Hermaphroditism in Mammals . . 237 



„ „ Hunter's Freemart in and Reversion 238 



Riddle, O. — Sex in Pigeons 23s 



Pezard, A. — Secondary Sex-characters in Fowls 23'.* 



Pearl, Raymond, & Maynie R. Curtis — Experiments on Oviduct of Fowl.. .. 239 



Levi. Guiseppe — Development of Visual Cells in Amphibians 240 



1'edaschenko, D. — Development of the Neives of the Eye-muscles 240 



Loeb, Jacques — Cluster Formation of Spermatozoa 341 



Loeb, Leo — Germ Cells and Somatic Cells .. 342 



Cowdry. E. V. — Development of Nerve Cells of the Chid: 348 



Hoskins, E. R. — Development of Rectal Gland of Squaius acanthias 844 



Reese, A. M. — Development of Lungs of Alligator 344 



