No. 2, September, 1920] GENETICS 213 



with stiff glumes). The early stools had a darker foliage than the late ones, which latter 

 bore flowers typical of the skinless oat. The straw, when mature, was reddish like that of 

 Algerian. Some of the seeds were naked and sonic were black or dark brown hulled. Prog- 

 enies of individual plants have been grown for several seasons and continue to be quite vari- 

 able, some having wholly naked, some half and half and some yielding only hulled seed. The 

 hulled seed germinated best and also yielded best. Crosses between this oat and Dun and 

 Ruakura have given no promising material. — An oat resembling A. fatua was found in a 

 progeny of the natural crossbred of the Sunrise varial ion. In this progeny most of the plants 

 resembled Sunrise and seed from such plants bred true, but the wild oat type split up remark- 

 ably. The plants varied in seed color, degree of awn, stoutness of straw and hairiness of 

 grain, some being thickly felted while others were smooth. Since none of these types were of 

 economic importance they were not persevered with. — Author states that well-marked varia- 

 tions which bred true have been found in the Kelsall's, Black Bell, Ruakura, and Winter Turf 

 variet ies. The characteristics of several varieties are given and the technique of oat crossing 

 described. — Under the heading of Barley Breeding the author records having found a few 

 plants of wild barley Hordeum spontaneum in a sample of wild wheat Triticum dicoccum 

 dicoccoides. The wild barley was crossed with the Standwell and Kinver varieties. The Fi 

 crossbreds were more vigorous than the cultivated parents. They were uniformly of the 

 Chevalier type and scattered easily. Plants in which the grain adhered more or less firmly 

 to the rachis and resembled malting barley were selected. In the F. t these selections compared 

 favorably in productiveness with Kinver, Standwell and a two-row selection from Chilian. 

 The straw is stronger, the awns stouter, the grain larger and the plants more drought-resistant 

 than the ordinary malting barleys. — Author's assistant crossed a two-row naked-awned bar- 

 ley with ordinary skinless, also Kinver malting barley with the two-row and naked type. 

 Among other variations the latter cross gave rise to a six-rowed bearded type. — Author states 

 that a Mr. Pe uock of the Bathhurst Experiment Farm found a natural crossbred in the 

 Standwell barley which gave rise to a two-rowed awnless, six-rowed awnless and a six-rowed 

 awned, all of which bred true. — J. H. Kempton. 



1613. Przibram, Hans. Ursachen tierischer Farbkleidung. [Causes of animal coat 

 colors.] Arch. Entwicklungsmech. Organ. 45: 199-259. 1919. 



1614. Punnett, R. C. The genetics of the Dutch rabbit. — A criticism. Jour. Genetics 

 9: 303-317. 1 pi., 2 fig. Mar., 1920. — -Author recognizes three true-breeding grades with 

 reduced pigmentation and frequent heterochromia iridis, viz., White Dutch, Spotted Dutch, 

 and Typical Dutch. Self-color is PPTTSS and White Dutch is ppttzs. S raises White 

 Dutch to Spotted Dutch and if T is also added pigmentation is increased to Typical Dutch. 

 P produces darker types and eliminates heterochromia. The various combinations of these 

 factors are fitted to Castle's data and this multiple factor theory is considered to agree better 

 than Castle's hypothesis of multiple allelomorphism of the four types, Self -color, Dark Dutch, 

 "Tan" Dutch, and White Dutch, and to make unnecessary his conception of "mutual modi- 

 fication."— P. W. Whiting. 



1615. Pye, H. Wheat breeding in its incidence to production. Agricultural research in 

 Australia. Advis. Council. Sci. and Ind. Commonwealth of Australia Bull. 7: 10-22. 1918. 

 — General discussion of the application of breeding to improvement of wheat. Author 

 records having noticed in the past few years many more natural crosses in wheat than hereto- 

 fore. This increase in crossing is attributed to lack of pollen, some varieties having been 

 lost through a failure to fertilize the ovules. An emasculated bearded wheat left to wind or 

 insect pollination produced nine seeds, eight of which germinated, six producing bald ears 

 and two bearded. Author lists four features which influence prolificacy and thirteen quali- 

 ties which are associated with prolificacy in its relation to inherency and economical harvest- 

 ing. — J. H. Kempton. 



1616. R. [German rev. of: Trow, A. H. On "albinism" in Senecio vulgaris L. Jour. 

 Genetics 6: 65-74. 1916. (See Bot. Absts. 1, Entry 947.) ] Zeitschr. Pflanzenziicht. 7: 141. 

 Dec, 1919. 



