Iflt] ANIMAL PRODUCTION. 605 



Lutear cells and hen-feathering', A. M. BOBTOG and T. II. BfOBOAN (lour, 

 cm.. Physiol, l (1918), s<>. i. /</<. i.n t.tt. fin*. ',). in b publication already 

 briefly aoted (E. S. K., 86, p. 66), Morgan stated Chat a hen-feathered Sebright 

 Bantam cock when castrated develops typical male feathers, just as Qoodale 

 (B. s. R., 38, p. 170) found spayed hens t<> do. in the presenl publication a re- 

 port is made nf ii histologic;! i examination of the testes of a Sebright cock. 



Groups Of cells were found in the connective tissue between the seminal 



tubules that were identical in appearance with the lutear cells found by Pearl 

 and Boring, .-is aoted above, in ovaries of hens. It is suggested that the secre- 

 tion of these cells in both the cock and the hen suppresses the development 

 Of male plumage. Cells of this sort were not found by Boring and Pearl 



(Hf. S. K., I!'.', p. 177) in the testes of ordinary adult males, although a few 

 were noted by Keeves (E. S. K., 34, p. 264). 



Post-mortem melanin pigment formation in pigmentless retinas and cho- 

 roids of white ringdoves, O. RlDDLE and V. K. La Mkr (Amor, .four. I'hi/xiol., 

 '/7 (1918), No. I, pp. 10.1-123).— The author finds that melanin (black) pig- 

 ment can be caused to appeal in the retinas and choroids of dead embryos 

 of the while ringdove (either pure-bred or extracted from crosses with the 

 blond ringdove) by providing abundant oxygen. Ordinarily these areas would 

 remain plgmentless Or nearly so throughout life. High temperature but not 

 killing by mercuric chlorid prevents pigment formation. 



These results are held to confirm the senior author's theory of melanin forma- 

 tion (E. S. K., 21, p. .'{71) and to render doubtful the current views of 

 geneticists as to the inheritance of color. "One needs to supply no new 

 hereditary unit nor extirpate an inhibitor to obtain an abundant supply of 

 melanin pigment." 



Commercial feeding stuffs and registrations for 1918, C. S. Catik art 

 {New Jersey Stas. Bill. 327 (1918), pp. £-79).— Report is made on 932 samples 

 of feeding stuffs collected under the State law iu 1918. The moisture, pro- 

 tein, fat, anil liber content of the following products are given: Alfalfa meal, 

 brewers' dried grains, distillers' dried grains, yeast dried grains, malt sprouts, 

 buckwheat fml. buckwheat middlings, buckwheat offal, coconut meal, copra 

 cake meal, cottonseed feed, cottonseed meal, corn bran, corn feed meal, corn 

 gluten feed, corn gluten meal, corn and cob meal, hominy feed, corn and oats, 

 dried beet pulp, linseed meal, oat hulls, peanut oil meal, rye bran, rye mid- 

 dlings, wheat bran, wheat feeding Hour, wheat feed, wheat middlings, wheat 

 and rye middlings, various mixed feeds, calf meals, and poultry feeds. The 

 moisture, protein, fat, and phosphoric acid content of fish scrap, meat scrap, 

 and digester tankage is given. 



Fodder substitutes: How wild vegetation is utilized in other countries 

 (Jour. Rd. Agr. [London], 25 (1918), No. k, pp. #8-452). — A summary is given 

 of research in Germany and the Scandinavian countries on the use of heather, 

 bracken, seaweed (especially Laminaria), reeds (Arundo), leaf fodder and 

 twigs, acorns, horse-chestnuts, potato tops, hazel catkins, and pine and tir 

 needles as feed substitutes for domestic animals. 



A comparison of roughages for fattening steers in the South, YV. F. Ward, 

 D. T. Gray, and E. R. Li.oyd (U. 8. Dept. Ayr. Bui. 762 (1919), pp. 36. fig. /).— 

 Steer feeding experiments using roughages readily available in the South with 

 cottonseed meal as the sole concentrate are reported here. Four winters' work 

 is represented, the first (1913-14) in cooperation with the Alabama College 

 Experiment Station, the last of a series (E. S. R., 31, p. 664), and the others 

 in cooperation with the Mississippi Experiment Station. There were two ex- 

 periments, each repeated a second year with slight variations. 



