DAIRY FARMING — DAIRYING. 79 



placenta. Up to the present time negative losuits only have been obtained in 

 the attempt to produce the characterisic effect of the secretion under normal 

 condilions by injecting extraeti^ of the fresh corpus luteum. 



On the differences in metabolism of rabbits' ova and their significance in 

 the sex problem, A. Rus.so {Hiol. CcntbL, 31 (1011), Nos. 2, pp. ol-oS, fiys. 5; 

 6, pp. 177-182, fig.s. 3). — Further details are given concerning the two kinds of 

 ova (K. S. R., 23. p. 472). as an answer to the author's critics. 



The Mendelian ratio and blended inheritance, S. IIatai (Amcr. Nat., 45 

 (1911), No. 530, pp. 90-106). — A mathematical presentation of blended inherit- 

 ance as a limiting case of alternative inheritance when dominance is imperfect. 



Creating new animals and plants, W. J. Spillman (Sci. .inter., lO.'t (1011), 

 Xo. 7, pp. 16 'i, 165, IS.'i, 185, Jig><. II). — Examjiles are given of the way in which 

 -Mendel's law may be used to improve domesticated animals and plants. 



Transmission of white in horses, AV. K. Castle (Breeder's Gaz., 50 (1011), 

 No. 15, p. O'/S). — A note on a white stallion which is a heterozygous dominant. 

 An estimate is given of the probable nature of his offspring. 



[Canary breeding] iBiomctrika, 7 (1910), No. 3, pp. 30S-J,08, figs. 3).— A 

 further discussion Ijy C. B. Davenport, A. R. Galloway, and D. Heron on articles 

 previously noted (10. S. R.. 20, p. 1072: 22, p. 172). 



On the influence of hybridizing on the form, color and markings of canary 

 eggs, A. voN Tsciiebmak (Uiol. CcntbL, 30 (1010), No. 19, pp. 6'il-6J,0).— 

 Female canaries were crossed with the siskin, linnet, goldfinch, bultinch, and 

 other wild birds. In length, breadth, and form the eggs had the characteristics 

 of the mother, whereas the color of the shell was frequentlj' the color of the 

 shell of the species to which the male belonged. 



A partial index to animal husbandry literature, C. S. I'LUiiB (Columbus, 

 Ohio, 1911, pp. O.'i). — This bibliography of books, articles, and experiment sta- 

 tion publications on animal husbandry was prepared with blank leaves so that 

 other useful titles might be added. " It is limited in the number of titles, but 

 many of the references are quite available, consequently the list should be 

 serviceable. The titles of many of the books are given in considerable detail, 

 thus indicating the nature of the contents. Occasional brief comments are 

 made by the writer on the value and standing of certain books, bulletins or 

 articles." 



DAIRY FARMING— DAIRYING. 



Studies of the protein requirements of dairy cows, F. W. Woll and G. C. 

 Humphrey (M'iseonsin Sia. Researclt Bui. 13, pp. 175-216). — This reports a 

 study of the milk records and character of the rations fed to the university 

 dairy herd for a perod of 9 years. 



The method of management of the herd and records of the individual cows 

 has been previously noted from time to time. Throughout the period there 

 has been a general improvement of the herd, but there have been marked varia- 

 tions in each period when the system of feeding followed has been nearly uni- 

 form. After making due allowance for these disturbing factors, however, the 

 results show that the production of the cows on high protein rations was in 

 general lower than that on medium protein rations. The average for periods 

 .A and C, when the medium protein ration was fed, was 321.66 lbs. of butter 

 fat per head per year, as against 307.9 lbs. for period B when a high protein 

 ration was fed. 



" The total value of the products per year per cow . . . was, for periods A 

 and C $87.15, and for period B, $80.49, a difference of $6.66 in favor of the 

 medium protein rations. The cost of the feed was for periods A and C $38, 



