No. 2, March, 1921] GENETICS 139 



averages of dependent variables when all but one independent variable are held constant. 

 These equations may be solved directly, but authors prefer method of successive approxima- 

 tion. Corrections are also obtained for variability within the group. — John Rice Miner. 



917. Meunissier, A. Observations faites a Verrieres par Philippe de Vilmorin, sur le 

 caractere "Hile noir" chez le pois. [Observations made at Verrieres by Philippe de Vilmorin 

 on the character "black-eye" in the pea.] Jour. Genetics 10: 53-60. July, 1920. — Most peas 

 have seeds with uncolored hilums or "eyes." Several varieties of black-eyed peas are de- 

 scribed. Black-eye X "white-eye" gives black-eye in Fi and 3 black-eye: 1 white-eye in F2 

 (TscHERMAK and Vilmorin). Exceptional results sometimes obtained, such as some black- 

 eyed progeny from crosses between two white-eyed varieties. Occurrence of plants from 

 such crosses with both black-eyed and white-eyed seeds in same pod or on same plant. Acci- 

 dental crossing responsible for some cases, but not when both kinds are on same plant. A 

 cross between uncolored seed-coats X garnet (reddish brown) seed-coats, produced in about 

 the Fs generation a few seeds with purple seed-coats (fluctuating unfixable character). Three 

 years later this purple-seed-coat race produced black- and "white-eyed" peas on the same 

 plants. Association of purple and "garnet" in same seed-coat gives appearance of black. 

 Purple seed-coat color and black eye tend to be genetically associated in some peculiar man- 

 ner. Tables showing observations given. Totals show 615 black-eyed seeds gave 407 progeny 

 with violet seeds to 208 plants with non-violet seeds; 562 white-eyed seeds produced by the 

 same plants from which the 615 black-eyed seeds came, gave 58 progeny with violet seeds to 

 504 with non-violet seeds. — Orland E. White. 



918. Meunissier, A. De quelques idees sur la selection des legumes. [Some ideas on 

 the selection of vegetables.] Rev. Hort. 91:300-303. June, 1919.— Popular discussion of 

 pure lines, genotypes, phenotypes, and modern ideas of selection in relation to horticulture.— 

 Orland E. White. 



919. Morgan, T. H. Castration of hen-feathered Campines. Proc. Soc. Exp. Biol. Med. 

 17: 70. 1920.— The results were the same as with hen-feathered Seabrights; namely, the 

 development of male plumage following the operation. — H. D. Goodale. 



920. Morgan, T. H. The endocrine secretion of hen-feathered fowls. Endocrinology 

 4: 381-385. 5 fig. July-Sept., 1920.— A restatement of the author's findings that in Sea- 

 brights, and Campines, the hen-feathered condition depends upon the presence of luteal cells 

 both in the ovary and testes. — H. D. Goodale. • 



921. Morgan, T. H. Whitman's work on the evolution of the group of pigeons. [Rev. of: 

 Whitman, Charles Otis, 1919. Posthtmious works of, edited by Oscar Riddle. Carnegie 

 Inst. Publ. No. 257. 3 vol.] Science 51: 73-80. Jan. 23, 1920.— Reviewer finds no real con- 

 tradictions between the results of Whitman, or even his interpretations, and the idea of discon- 

 tinuity or mutation. Unit characters, when their development and manifestations are inter- 

 preted from the standpoint of chemistry, need not be so absurd as Whitman conceived them 

 to be. Since any or all steps in ontogeny may be modified by a single factor. Whitman 

 seems to have put undue emphasis upon ontogenetic development in his interpretation of 

 phylogenetic relationships. — H. G. May. 



922. Nevens, W. B. Breed and size of cows as factors affecting the economy of milk 

 production. Jour. Dairy Sci. 2:99-107. 3 fig. 1919.— A ratio, based on the geometrical 

 theorem that the surface of two solids of similar shape are to each other as the squares of 

 the cubes of their weights, is worked out to show the relation between the maintenance require- 

 ments of animals of different weights. Thus the maintenance requirements of a cow of known 

 weight being available, the maintenance requirements of cows of any known weight may be 

 calculated.— A study of the records, weights and feed consumption of the cows used in the 

 Wisconsin cow competition indicates that the larger cows of the Holstein, Guernsey and 

 Jersey breeds consumed less feed in proportion to size than did the smaller cows. Also the 



