No. 3, October, 1921] GENETICS 217 



gave all red raspberries. Crosses were also made between Cuthbert and blackberry, logan- 

 berry and raspberry, currant and gooseberry, and European and American gooseberry. The 

 report closes with a statement of the objects sought in breeding corn, cucumbers, egg plant, 

 peppers, garden peas, potatoes, and tomatoes. — R. Wellington. 



1362. Pease, M. S. German lev. of: Stakman, E. C, J. H. Parker, and F. J. 

 PiEMEisEL. Can biologic forms of stem rust on wheat change rapidly enough to interfere with 

 breeding for rust resistance? Jour. Agric. Res. 14: 111-124. 5 pi. 1918 (see Bot. Absts. 1, 

 Entry 500; 2, Entry 397).] Zeitschr, Indukt. Abstamm.- u. Vererb. 26: 179-180. 1921. 



1363. PfizARD, A. Numerical law of regression of certain secondary sex characters. Jour. 

 Gen. Physiol. 3: 271-283. 8 fig. 1921. — The rate at which the comb of a castrated cock 

 shrinks is expressed by a parabola having the formula L = I + ^ C {O-ty, where L is final 

 length of comb, C a constant for each individual, t? duration of shrinkage, / length of comb 

 at some particular time, t. It was also noted that C t? is nearly constant. — //. D. Goodale. 



1364. Pickett, B. S. Correlations between fruit and foliage in strawberries. Proc. 

 Amer. Soc. Hort. Sci. 14: 56-59. 1917 [1918]. — A summary of the relationship between (1) 

 the average weight o" berries and average area of leaflets, (2) the total production of fruit 

 and total area of the foliage, (3) the number of leaves and the number of berries, is presented 

 for 900 seedlings, the progeny of crosses of 17 varieties of strawberries. The correlation 

 between (1) number of leaves and berries was .4792 =*= 0.0022, (2) average area of the leaflets 

 and average weight of fruit 0.28904 =»= 0.00456, and (3) total area of foliage and total weight 

 of fruit 0.7503 =*= 0.0012, It was concluded that it was not practical to use these correla- 

 tions as a basis of eliminating strawberry seedlings. — W. D. Valleau. 



1365. PuNNETT, R. C., AND P. G. Bailey. Genetic studies in poultry. III. Hen-feathered 

 cocks. Jour. Genetics 11: 37-57. PI. 7-11, 2 fig. 1921. — The authors accept for the present 

 Morgan's theory that hen-feathering in the cock is due to the presence of luteal cells. They 

 regard hen-feathering in cocks to be the result of a single factor, which, however, is distinct 

 from the one that produces the normal hen plumage. The former is transmitted equally to 

 both sexes, the latter only to females. The factor producing hen-feathering in males is 

 dominant, but intermediate forms occur among heterozygotes. These, in their 1st year's 

 plumage, may resemble very closely normal males, but in the succeeding moult take on almost 

 entirely the plumage of the hen-feathered males. — H. G. May. 



1366. Rasmuson, Hans. Beitrage zu einer genetischen Analyse zweier Godetia-Arten 

 und ihre Bastarde. [Contribution to a genetical analysis of two Godetia species and their 

 hybrids.] Hereditas 2: 143-289. 1 pi., 29 fig. 1921. — Results are described of varietal and 

 specific crosses in Godetia Whiineyi and G. amoena. The work was begun in 1917 with commer- 

 cial seed. The procedure involved crosses between types of unknown genotype. Parental 

 plants were selfed in each case. In the event of segregation of selfed plants their progeny was 

 further tested during the next 2 seasons. The progeny of crosses was also carried through 

 to Fa and in some cases to F3. The number of differential characters is considerable and some 

 of the phenotypes are highly modifiable, making their separation uncertain. The populations 

 were in general small. The interspecific hybrids were almost completely sterile, though enough 

 Fj plants were secured in some cases to show that the genes behave in the same manner as in 

 varietal crosses. For these reasons the author's conclusions are put forward in some cases 

 with caution. The characters studied were color, size, and doubleness of corolla, color and 

 shape of leaves, and habit of growth of plant. Heritable differences were demonstrated for 

 all these characters and a factorial analysis proposed for the following: (1) G. Whitneyi. 

 (a) aa plants have yellow-margined petals ; (b) B plants in the absence of other dominant color 

 genes have pale violet-colored petals; (c) C in place of B gives rose varying to nearly white; 

 (d) D alone has no effect, but with B or C produces lilac; (e) E produces red petals; (f) F 

 with E gives red with light-margined petals but alone has no effect; (g) G produces a red 

 spot in the middle of the petal; (h) H enlarges the set but alone is without effect; (i) / gives, 



