268 GENETICS [Box. Absts., Vol. VIII, 



1899. Bryan, W. E., and C. O. Bond. Plant breeding. Arizona Agric. Exp. Sta. Rept. 

 29: 314-321. 1918. — Breeding results obtained in an effort to produce wheat of high yield 

 with high gluten content of superior quality. For irrigated valleys of Arizona earliness is 

 of prime importance in establishing such a wheat. Where late spring irrigation is necessary 

 for late varieties quantity and quality of gluten are reduced. — Brief reports of investigations 

 with beans, alfalfas, and sorghums are also made. — /. P. Shelton. 



1900. Burgess, C. H. Breeding for egg production. Michigan Agric. Exp. Sta. Quart. 

 Bull. 2 : 190-192. 1 fig. 1920. — Data are presented which indicate "that higher egg-producing 

 power" may be introduced into a flock of barred Plymouth Rocks or single-comb white Leg- 

 horns through males from high-producing dams.— William A. Lippincott. 



1901. Bush-Brown, H. K. Heredity in horses. Jour. Heredity 11: 215-227. Fig. 16-27. 

 1920. — Distinction is made between skeleton of the Arab horse, which has 5 lumbar 

 vertebrae, and all other horses, which have six. This difference is given as one of the out- 

 standing causes of the greater endurance of the former. The limited data available indicate 

 the short back to be recessive to the long back. A jenney bred to a stallion produced a hinney 

 which inherited the 5 lumbar vertebrae of the dam. Likewise, a short-back mare bred to a 

 stallion with 24 vertebrae produced a short-back offspring. The 3 instances of this combina- 

 tion led the author to suggest the dominance of the dam over the anatomy of the foal. The 

 strength of the Arab horse as a weight-carrier is attributed to the shorter distance between 

 the supports. In the army tests of 1920 the endurance of the Arab horses and their derivatives 

 was superior to that of others. — M. J. Dorsey. 



1902. Cherry, T. The evolution of man and his mind. Sci. Prog. [London] 15: 74-100. 

 1920. — A speculation in regard to the origin of man. "The recent advances in knowledge 

 have introduced new difficulties both on the side of structure and of function, and have made 

 untenable the current theory of the comparatively recent separation of the human and the 

 ape stocks." These difficulties are discussed under 2 examples of structure — (a) the premax- 

 illa, present in the apes and absent in man, and (b) the foot; and 2 examples of function — (a) 

 instinct, practically lacking in man, and (b) the growth and metabolism of the body, based 

 on Rubner's work. Other difficulties are mentioned and the importance of Dollo's law 

 of the "irreversibility of the course of evolution" is emphasized. — The writer then undertakes 

 to reconstruct a theory of human phylogeny. He starts with "a generalized primate of the 

 Anaptomorphus type .... about as large as a rat," inhabiting trees of the Lower 

 Eocene and feeding on birds chiefly by night. Probably during the Eocene "the lemurs, 

 New World monkeys, and Old World monkeys separated from one another" and in the Upper 

 Eocene "the branch of the Old World monkeys which gave rise to the apes and man came to 

 the ground." The common ancestor acquired a fair approximation to a bipedal gait and the 

 diet consisted largely of lizards, grubs, and scorpions as evidenced by the digestive organs. 

 The changes that now take place leading toward man require 2 conditions of environment, 

 namely, abundance of easily obtained nitrogenous food, and safety. These conditions are 

 most fully met on the seashore. "It is therefore in no way improbable that one family of the 

 Late Eocene primates may have chanced on some part of the beach where shellfish are plentiful 

 and there begun a course of evolution different from all their former associates in the trees." 

 Ancestors of the apes from time to time, but at a very early period, left the seaside and 

 returned to the trees; first, the early gibbons, next the orang, and finally the common ancestor 

 of the gorilla and chimpanzee, leaving the human stock to work out its evolution under sea- 

 side conditions. The writer then develops his theory of the evolution of man in adaptation 

 to a seashore environment, including small teeth, slow movements, lack of organs for attack 

 or defence, naked skin, monthly cycle in woman, free shoulder-joint, and development of the 

 brain. — Howard J. Banker. 



1903. Collins, G. N. Dominance and the vigor of first generation hybrids. Amer. Nat. 55 : 

 116-133. 1 fig- Mar.-Apr., 1921. — Author believes that the explanation of heterosis should place 

 emphasis on suppression of deleterious recessive characters rather than on accumulation of 



