168 EXPERIMENT STATION RECORD. 



and 1913 on the cell, reproduction, heredity, variation, the origin of species, and 

 related topics, with abstracts of the more important publications, and con- 

 tinuing similar work (E. S. R., 26, p. 470). 



Handbook of comparative physiology, edited by H. Wintebstein {Hand- 

 huch der Verglcichcndcn Physiologie. Jena: Gustav Fischer, 1911-1914, vol. 3, 

 1. half, pp. 2041+XIII, pis. 2, figs. 567; 1910, 1912-1914, vol. 3, 2. 'half, pp. 

 1060+XII, pi. 1, figs. 456). — The first half of this very extensive and complete 

 review of work on comparative physiology includes chapters on Physiology of 

 Motion, by R. du Bois-Reymond (pp. 1-248) ; The Production of Sound and 

 Noise, by O. Weiss (pp. 24&-318) ; Physiology of Supportive and Skeletal Sub- 

 stances, by W. Biedermann (pp. 319-1188) ; The Color Variation and Chromatic 

 Skin Function of Animals, by R. F. Fuchs (pp. 1189-1656) ; and Color and De- 

 sign of Insects, by W. Biedermann (pp. 1657-1994). The second half contains 

 chapters on The Production of Heat, by R. Tigerstedt (pp. 1-104) ; The Produc- 

 tion of Electricity, by S. Garten (pp. 105-224) ; The Production of Light, by 

 E. Mangold (pp. 225-392) ; Physiology of Formation, by H. Przibram (pp. 393- 

 456) ; and Physiology of Reproduction, by E. Godlewski (pp. 457-1022). 



Review of experimental breeding investigations in zoology since 1900, 

 A. Lang {Die experimentelle V ererhungslchre in der Zoologie seit 1900. Jena: 

 Gustav Fischer, 1914, pp. VII-\-892, pis. 4, figs. 244). — This comprises a large 

 number of papers reviewing investigations on the theory of inheritance and dis- 

 cussing the biometrical phas3s of variation and correlation. The latter portion 

 of the volume reviews crossbreeding experiments with animals of the rodentia, 

 carnivora, and ungulata families. Under the latter heading are included the 

 equidse, ruminants, and swine. The topics treated include the inheritance of 

 coat coloring, points of conformation, horns, breed characteristics, milking 

 capacity, and similar items. The papers have been previously reported from 

 other sources. 



German zootechny (Jour. Heredity, 6 (1915), No. 3, pp. 109-116).— This 

 article is a review of a book by G. Wilsdorf on animal breeding (E. S. R., 27, 

 p. 469), in which he shows the important part the science of genetics has played 

 in the development of the live stock industry of Germany. 



Sex determination and sex control in guinea pigs, G. Papanicolaou 

 (Science, n. ser., 41 {1915), No. 1054, PP- 401-404)- — The author concludes from 

 his observations that " the sex of a guinea pig is determined sometimes by two 

 and sometimes by three factors, depending upon whether the mother has pre- 

 viously borne young. The first factor is the sex tendency of the father. If the 

 father has a male sex tendency, his sons will have a female tendency and 

 his daughters a male tendency. If, on the contrary, the father possesses a 

 female tendency, his sons will have male tendencies and his daughters female 

 tendencies. 



" The second factor is the sex tendency of the mother. A mother with a male 

 tendency gives her daughters a female and her sons a male tendency. The 

 mother with a female tendency gives her daughters a male and her sons a 

 female tendency. The third factor is confined to the female and is a change 

 of sex tendency from litter to litter. This change in tendency manifests itself 

 in the following way : If the first litter contains only males, the mother acquires 

 a female tendency for the next litter and vice versa. This new tendency varies 

 in strength, depending upon the number of young of one sex contained in a 

 litter. The greater the number of males in a litter, the stronger the female 

 tendency will be for the next litter. This tendency is still more emphasized if 

 the mother is successively mated with males of a definite tendency, and there- 

 fore forced to produce more and more young of one sex. 



