No. 1, July, 1920] GENETICS 1 L5 



to pheasants. I'ullcts, when completely castrated, developed male plumage and spun. — 



(2) New results. A particular feature is the series of measurements involving body weight, 



and leiij^l h of comb and spurs. In the east r:i ted male t he growl h of t he comb is direct |y pro- 



portional to the cube root of the body weigh) at corresponding ages, bu1 in tie' is ock, 



t here is a marked aecelerat ion ;it puberty in eouib growl h over t In- cube rool of body weight . 



The rate of increase in length of spurs in both castrated and intact bird-' relative to body 

 weight is the same. In males, castrated after complete sexual maturity, there I loss of 

 crowing and sexual instincts with a regression of comb and wattles, the latter proportional 

 to the length of time following the operation. — Transplantation of testes, or what is more 

 remarkable, the injection of extract of ci-ypt orchid pig testes into castrated males results 

 in the growth of comb and wattles and the reappearance of sexual and crowing instincts. — 

 Pullets containing implanted testes developed large combs and wattles. — Several instances of 

 gynandromorphism are described. The relation between castration, the liver, fat and glyco- 

 gen formation is discussed, the theorem being developed that the testes elaborate a hormone 

 for the utilization of fat in reproduction. — //. D. Goodale. 



703. Pierpaoli, I. Observations on the medlar tree flower and the origin of the stoneless 

 medlar in Italy. Atti R. Accad. Lincei Rend. CI. Sci. Fis., Mat. e Nat. 1: 121-125. 



704. Pitsch, O. Erfelykheid en cultuur. Ik ben, ik leef, ik denk. (Heredity and cul- 

 ture. I am, I live, I think.) Mededeel. R. H. L. T. B. school. Wageningen 13: 105-204. 

 191S. — A philosophical treatment of the fundamental principles of heredity in their rela- 

 tion to culture, founded upon Descartes' "cogito, ergo sum," and following the lines of Hegel's 

 philosophy. It is wholly impossible and from the viewpoint of the geneticist unnecessary 

 to review the author's exposures. — M. J. Sirks. 



705. Placzek. Die Bekampfung vererbbarer Nervenkrankheiten. [The combating of 

 hereditary nervous diseases.] Zeitschr. Nerven. 59: 1918. 



706. Plahn-Appiani. Die Individualitat von Zucker- und Futternibe. [Individuality of 

 sugar beets and fodder beets.] Centralbl. Zuckerind. 1919. 



707. Plahn-Appiani. Das Wurzelgewicht der Beta-Ruben im ziichterischen Sinne. 

 [Weight of beet roots in a breeding sense.] Centralbl. Zuckerind. 1919. 



708. Popenoe, Wilson. Improvement of the avocado by crossing. California Citrograph 

 3: 1S1. June, 1918. — Author briefly characterizes the three "races" of the avocado (Persea 

 americana), the West Indian, Guatemalan, and Mexican, noting especially the commercial 

 value of the fruit of the second and the hardiness and early ripening of the third. A sup- 

 posed cross between the last two races is described, and the possibility that the variety Fuerte 

 resulted from such a cross is mentioned. — Howard B. Frost. 



709. Propeit, W. J. Cereal improvement at Svalof. Scotland Jour. Agric. 1 : 404-414. 

 1918. — Gives origin and purpose of Swedish Seed Association. Discussion of methods used for 

 cereal improvement. — H. H. Love. 



710. Przibram, Hans. Uber experimentelle Vererbungsforschung. [Experimental 

 studies on heredity.] Sitzungsber. anthropol. Ges. Wien 48: 47-51. 1918. — Author discusses 

 briefly a number of results of experimental work in genetics, of interest to anthropologists. 

 The physiology of animal pigmentation is discussed most extensively. An effect of high tem- 

 perature on the coat color of rats (gray changed to red) is described. Heredity of the modified 

 color was not tested. An increase in relative tail lengths of rats at high temperature was 

 found not to be inherited. — Sewall Wright. 



711. Rabaud, Etienne. La panachure du pelage et les phenomenes hereditaires chez la 

 souris. [Variegation of the pelage and the phenomena of heredity in mice.] Bull. Soc. Zool. 

 France 43 : 49-56. 1918. — Mice bred to F 4 from wild gray X albino (neither strain variegated) , 



