RECENT ADVANCES IN SCIENCE 233 



produce Reissner's fibre stain, similarly to elastin. The peculiar 

 uplifting of the tail that was recorded by Nicholls after 

 severing the posterior end of the fibre is also stated to have 

 been obtained by other injuries to the tail of the fish not 

 involving the fibre itself. 

 Other papers include : 



White, "Association and Colour Discrimination in Mud-minnows and Stickle- 

 backs'' (Journ. Exper. Zool., vol. xxvii, Feb. 1919) ; Bigney, "The Effect of 

 Adrenin on the Pigment Migration in the Melanophores of the Skin and in the 

 Pigment Cells of the Retina of the Frog" (Journ. Exper. Zool., vol. xxvii, Jan. 

 1919) ; Clark, "On the Relation of Certain Cells in the Tadpole's Tail toward 

 Vital Dyes" (Anal. Rec, vol. xv, Dec. 1919) ; Swingle, "Studies on the Relation 

 of lodin to the Thyroid : I, The Effects of Feeding Iodin to Normal and Thyroi- 

 dectomised Tadpoles " (Journ. Exp. Zool., vol. xxvii, 1919) ; Swingle, " II, Com- 

 parison of the Thyroid Glands of Iodin-fed and Normal Frog Larvae " (ibid., Jan. 

 1919). 



" The Relation of Plumage to Ovarian Conditions in a 

 Barred Plymouth Rock Pullet " has been described by Cole 

 and Lippincott {Biol. Bull., vol. xxxvi, March 1919). This 

 pullet, normal at first, later assumed male plumage, and the 

 apparent cause was the development of a large ovarian tumour. 

 A piece of ovary from another pullet was subsequently im- 

 planted in the pullet, and later the feathers removed from the 

 left side of the body. When these feathers were regrown 

 they were of the hen type, so that now one side was male- 

 plumaged and the other side was female — that is, as far as the 

 structure and shape of the feathers were concerned ; but, 

 strangely enough, in both cases the width of the barring was 

 that of the female. 



Other papers include : 



Allen, " Glycogen in the Chick Embryo" (Biol. Bull., vol. xxxvi, Jan. 1919) ; 

 Alsop, "The Effect of Abnormal Temperatures upon the Developing Nervous 

 System in the Chick Embryo" (Anal. Rec, vol. xv, Jan. 1919) ; Danforth, "The 

 Relation of Brachydactylism to Other Characteristics in the Domestic Fowl" 

 (Amer. Journ. Anal., vol. xxv, March 1919) ; and Poynter, "Some Observations 

 on Wound- Healing in the Early Embryo " (Anal. Rec, vol. xvi, March 1919). 



Hartman has added two further papers to his series on 

 Marsupial embryology in " Studies in the Development of the 

 Opossum (Didelphys virginiana) : III, Description of New 

 Material on Maturation, Cleavage, and Entoderm Formation ; 

 IV, The Bilaminar Blastocyst " {Journ. Morph., vol. xxxii, 

 March 1919). In these papers the author records his observa- 

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