>111 CONTENTS. 



NOTES. 



PACK 



Two Letters from Professor Abbe to John "Ware Stephenson. Communicated by 



J. F. Cheshire. (Two facsimile Figs.) 198 



Technical Optics • .. 279,558 



OBITUARY. 



Robert Braithwaite, M.D. M.R.C.S. F.L.S. F.R.M.S. By A. W. Sheppard .. .. 560 



SUMMARY OF CURRENT RESEARCHES. 



ZOOLOGY. 

 VERTEBBATA. 



«• "Embryologry- 



GooDiLE, H. D. — Gonads in Relation to Secondary Sex-characters of Birds .. .. 106 



AssHETOx, Richard (the late) — Growth in Length 108 



Swift, Charles H. — Origin of Sex-cords and Spermatogonia in Male Chick .. .. 109 



LocY, W. A., & Olof I^ausblIj— Development of Bird's Lung 110 



Kellicott, W. E. — Influence of Loio Temperature on Development of Fxmdulm .. 110 



MacBride, E. W. — Experimental Embryoloijy 204 



Etjth, Edward S. — Twin-embryos in Dud: 205 



Laurent, O. — Siamese Grafting 205 



Castle, W. E. — Inheritance in Guinea-pujs and Eats 205 



Schmidt, JoHs. — Earhj Larval Stages of Eels 206 



GuDGER, E. W. — Eggs of Gaff-topsail 207 



Wiemann, H, L. — Chromosomes of Human Spermatocytes 281 



Pearl, Raymond — Eff'ect of Alcohol on Germ-cells 282 



Reagan, Franklin P. — Origin of Germ-cells in Chich 282 



Smith, H. P. — Ovarian Cycle in Mice 282 



YA'sikQk\{k,'^lKKOio^New Protamines from Milt 283 



Riddle, Oscar — Inequality of the Testes in Pigeons 283 



Werber, E. I. — Blastolytic Origin of Independent Lenses 283 



O'Uonoghue, Chas. H. — Development of Vascular System in Beptiles 284 



Loeb, Jacques — Sex of Parthenogetically-developed Frogs 284 



HuBER, G.Carl — Seminiferous Tubules of Btj-ds 284 



King, Helen Dean — Age and Fertility in Bats 285 



'i!^EAL,'H..Y.— History of Eye Muscles '-ISd 



Gejimill, James F., & James Stewart — Rare Form of Double Monstrosity .. 285 



KiBHMAN, W. B. — Prolonged Gestation in Suckling Mice 286 



Smith, P. E. — Effect of Extirpating Hypophysis on Growth and Development of Frog 286 



HosKiNS, E. R. — Influence of Diet on Ductless Glands 287 



KiKG, Helen Dean — Undersized Neic-born Bats 287 



Arey, 1j. B. — Origin of Osteoclasts 287 



