162 GENETICS [BoT. Absts., Vol. X, 



per cent; 396 flowers X Shropshire set 29.6 per cent; 354 flowers X Reine Claude set 47.4 per 

 cent. In Shropshire, 3591 open-pollinated flowers set 5.8 per cent; 599 flowers selfed set 2.0 

 per cent; 433 flowers X German Prune set 13.6 per cent; 381 flowers X Heine Claude set 12.0 

 per cent. Inter-species crosses between P. triflora and P. domestica and between P. domes- 

 tica and P. insititia are fertile. — C. S. Crandall. 



1058. Jacob, Joseph. Tulip thieves. Card. Chron. 69: 299. 1921. — The author refers 

 to an item by E. H. Krelage, published in 1881, concerning an occasional form of atavism in 

 which tulips return to a form with narrow petals, mostly of one color, — a pale mauve pink. 

 He adds to these "thieves" another form in which, instead of blooming, the bulb produces 

 but one big leaf and later many small bulblets, which continue to behave in the same manner 

 and, if not rogued out, presently dominate and produce a deteriorated stock. — /. Marion 

 Shull. 



1059. Jones, Sarah V. H. Inheritance of silkiness in fowls. Jour. Heredity 12: 117- 

 128. Fig. 9-15. 1921. — The author reviews the literature on several silky breeds of fowls and 

 shows that the sporadic appearance of silky-feathered individuals in flocks of normally- 

 feathered fowls is not rare. Previous work on the genetics of silkiness is summarized and 

 data covering the genetic constitution of a sporadic silky individual are presented which 

 show that it is geneticallj^ identical, so far as feather structure is concerned, with the common 

 Japanese silky breed. — W. A. Lippincott. 



1060. Kempton, J. H. Heritable characters of maize. V. Adherence. Jour. Heredity 

 11: 317-322. Fig. 16-19. 1921. — Adherence is a variation in which the leaves, bracts, and 

 inflorescences coalesce. In some cases this abnormality is apparent in the seedling stage, 

 but such plants usually recover and grow normally until the ear-bearing node is reached, when 

 adherence again appears. Because of the coalescence of the upper leaves and tassel the latter 

 is exserted with difficulty. The tassel branches cling together to form a solid structure so 

 that pollen is shed only from the spikelets of the lower and outer branches. This abnormality 

 is apparently due to a single Mendelian factor and can very readily be eliminated. — W. H. 

 Eyster. 



1061. Lamon, Harry M. Lamona — a new breed of poultry. Jour. Heredity 12: 3-29. 

 Frontispiece, fig. 1-26. 1921. — The author attempted to establish a new breed of fowls com- 

 bining the characters of the egg and meat types, and laying white eggs. White Plymouth 

 Rocks and White Leghorns were used, the former as a general utilitj' bird and the latter as the 

 egg type, used also to introduce the white egg character. The Silver Gray Dorking was used 

 to introduce good meat qualities and the long, rectangular body. The object was "to pro- 

 duce a breed of fowls of two varieties (single and rose comb) having the shape, size, and market 

 qualities of the Dorking with a yellow skin, white plumage, and four toes, and that will lay a 

 large, white egg." The project, begun in the spring of 1912, has been carried through several 

 generations and the single-comb variety has been fairly well established. — H. G. May. 



1062. Latjghlin, Harry H. Race assimilation by the pure-sire method. Jour. Heredity 

 11: 259-263. 4 fig. 1920. — The greater potency of the pure-sire method over the pure-dam 

 method in race assimilation is demonstrated from both physiological and social considera- 

 tions. The latter are dwelt upon at considerable length and illustrated with pedigree charts 

 from early Spanish-American sources, from a hypothetical case in Ibanez's "The Four Horse- 

 men of the Apocalypse", from a Jamaican Jewish-Negro family, and from a Jamaican Hindu- 

 Negro family. The writer concludes, "whenever 2 races come into intimate contact the 

 upper race tends to remain pure while the lower tends toward assimilation into the upper by 

 the pure-sire system." — Howard J. Banker. 



1063. LiLiENFELD, F. Die Resultate einiger Bestaubungen mit verschiedenaltrigem 

 Pollen Cannabis sativa. [Results of pollinations of Cannabis sativa with pollen of different 

 ages.] Biol. Zentralbl. 41: 295-303. 1921.— The author tested the claims of Ciesielski 



