ANIMAL PRODUCTION. 371 



Studies on inheritance in pigeons. — II, A microscopical and chemical 

 study of the feather pigments, O. Lloyd-Jones (Jour. Expt. Zool., 18 (1915), 

 No. 3, pp. 45S-509, figs. 63). — This is a coutinuation of work previously reported 

 (E. S. R., 31. p. 572), and the results are summarized as follows: 



'• The six fundamental self colors of tumbler pigeons have been accounted for 

 by the interaction of four genetic factors : R, red ; B, black ; /, intensity ; 8, 

 si)reading. Evidence as to the nature of the factor B has been secured from 

 its effect on the feather pigment with respect to (a) color, (b) manner of 

 formation and distribution, (c) physical form, and (d) chemical properties. 

 All of these seem to indicate a different mechanism from that which produces 

 red pigment, rather than simply a later stage of the same process. If unin- 

 fluenceii by other factors, the final result of the pigmentation process in a bird 

 carrying B, is the clumping of the pigment into the middle of the barbule cells. 

 The factor S when present stops this clumping process and results in a ' spread ' 

 condition of the pigment. S may properly be considered as an inhibitive or 

 ' stopping factor.' 



"As regards the increment of pigment substance, factor / probably has a 

 constant effect when acting on dilute birds of different constitutions, namely, 

 to increase by about three times the amount of pigment produced. As regards 

 its influence on granule shape, on the other hand, it I'eacts in a different manner 

 with each combination of factors. The facts concerning the granule shape in 

 blacks suggest the possible existence of a factor not yet determined which is 

 specifically concerned with granule shape. 



" Genetic research which is confined only to obvious characters is often super- 

 ficial, and in such cases microscopic research is necessary to distinguish the 

 independently heritable characters involved." 



A bibliography is included. 



Inspection of feeding stuffs, A. W. Clark (New York State 8ta. Bui. 404 

 (1915), pp. 221-334). — Analyses are given of the following feeding stuffs: 

 Cotton-seed meal, linseed meal, malt sprouts, distillers' dried grains, brewers' 

 dried grains, corn gluten feed, corn gluten meal, hominy feed, molasses feeds, 

 tankage, meat meal, meat scrap, blood flour, beef scrap, fish scrap, alfalfa meal, 

 wheat bran, wheat middlings, ground buckwheat screenings, corn meal, barley 

 middlings, corn bran, wheat screenings, ground corn screenings, flax screenings, 

 pea meal, dried beet pulp, shredded wheat waste, and various mixed and pro- 

 prietary feeds. 



Analyses of feeding stuffs, P. H. Wessels et al. (Rhode Island Sta. Insp. 

 Bui., 1915, May, pp. 16). — Analyses are reported of beef scrap, fish scrap, meat 

 and bone scrap, cotton-seed meal, linseed meal, gluten meal, gluten feed, malt 

 sprouts, distillers' grains, malt screenings, wheat shorts, middlings, bran, 

 hominy feed, alfalfa meal, aud various mixed and proprietary feeds. 



How to comply with the law regulating the sale of concentrated feed 

 stuffs in Texas, [and] other information, B. Youngblood (Texas Sta. Circ. 6, 

 n. ser. (1915), pp. 14). — This circular gives the text of the law regulating the 

 sale of feeding stuffs in the State of Texas, and gives directions for complying 

 with this law. 



Cattle feeding.— X, Winter steer feeding, 1913-14, J. H. Skinnee and 

 F. G. King (Indiana Sta. Bui. 118 (1914), PP- S^S-^SS^).— This is a continuation 

 of work previously noted (E. S. R., 30, p. 767). The object was to determine 

 the comparative value of leguminous hay alone and in combination with corn 

 silage as roughage for full-fed cattle; to compare oat straw and leguminous 

 hay as dry roughage for full-fed cattle receiving all the corn silage they will 

 eat; to compare different quantities of cotton-seed meal In rations containing 



51GG°— No. 4—15 6 



