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



"in the animal the rudiments of the gametes are often visibly separated at an early embryonic 

 stage, whereas in the plant they are given off from persistent growing points." Considering 

 the work of Nilsson-Ehle and East on cumulative factors, the author concludes that "many 

 factors can, and on occasion do, break up as the sex-factor almost certainly does. . . ." 

 — Merle C. Coulter. 



517. Blakeslee, Albert F. A chemical method of distinguishing genetic types of yellow 

 cones in Rudbeckia. Zeitschr. Indukt. Abstamm.- u. Vererb. 25: 211-221. PI. 9. 1921. — 

 The author reports on the variation of Rudbeckia hirta possessing a yellow disk or cone. 

 Treatment of yellow-coned plants with alkalies revealed 2 types; in one the cones turned black- 

 ish and in the other reddish. Each type proved to be a simple Mendelian recessive when 

 crossed with normal purple cone. The 2 yellow types crossed gave purple plants in Fi and a 

 ratio of 9 purples to 7 yellows in Fo. Alkalies showed that F2 yellows were again of blackish 

 and reddish-yellow kinds. Chemical treatment indicated in the yellow group what might 

 correspond to the double recessive expected once in every IG F2 individuals. No genetical 

 tests were applied to identify this yellow type, — James P. Kelly. 



518. Blandenier, A. E. Note sur les principaux cotons egyptiens at leurs hybridations. 

 [Note on the principal Egyptian cottons and their hybrids.] Proc. Verb. Soc. Vaud. Sci. 

 Nat. 11. 1920. — The author was collaborator of the late Professor Sickenberger, who is quoted 

 to the effect that Egyptian cottons have undergone continual transformation as the result 

 of incessant natural hybridization. The author regards existing Egyptian varieties as com- 

 plexes of hybrids among 4 species of Gossypium, — G. arhoreum, G. barbadense, G. tomen- 

 tosum, and G. herbaceurn, — and claims that the several interspecific hybrids present in each 

 variety-complex can be distinguished by the color of the "fuzz," or short hairs, on the seed. 

 — T. H. Kearney. 



519. Blaringhem, L. Metamorphose des etamines en carpelles dans le genre Papaver. 

 [Metamophosis of the stamens into carpels in the genus Papaver.] Compt. Rend. Soc. Biol. 

 83: 1521-1523. 1920. — Papaver bracteatum ordinarily shows few variations. Tardy shoots, 

 however, have been observed to give small, abnormal flowers in which there is surprisingly 

 complete metamorphosis of stamens into carpels. The author thinks the change is due to a 

 disturbed equilibrium in water relations, the stem providing more water than can be tran- 

 spired by these tardy and underdeveloped buds. This metamorphosis is exceptional in P. 

 bracteatum, but a similar phenomenon commonly occurs as a heritable mutation in P. som- 

 niferum polycephalum. — Merle C. Coulter. 



520. Blaringhem, L. Note sur la xenie chez le chataignier. pjenia in the chestnut.] 

 Bull. Soc. Bot. France 66: 354-356. 1919. — Castanea saliva crossed with C. dentata resulted in 

 an enlarged embryo intermediate between the 2 parents. The enlarged embryo ruptured the 

 wall of the ovule. — A. Gershoy. 



521. C, G. H. Studies in animal inheritance. [Rev, of: (1) Castle, W. E. Studies of 

 heredity in rabbits, rats and mice. Carnegie Inst. Washington Publ. 2SS, 56 p., S pi. 1919 

 (see also Bot. Absts. 6, Entry 723) . (2) Oxslow, H. The inheritance of wing colour in Lepi- 

 doptera. 1. Abraxas grossulariata var. lutea (Cockerell). Jour. Genetics 8: 209-259. PI. 

 9-10, 25 fig. 1919 (see Bot. Absts. 4, Entry GS9). (3) Harrison, J. W. Heslop, Studies m 

 the hybrid Bistoninae, III. The stimulus of heterozygosis. Jour. Genetics 8: 259-205. -2 fig. 

 1919 (see Bot. Absts. 4, Entry 59G). (4) Hixdle, Edward. Sex inheritance in Pediculus 

 humanus var. corporis. Jour. Genetics 8: 267-277. 1 chart. 1919 (see Bot. Absts. 4, Entry 

 611).] Nature 106: 297. 1920. 



522. Clattssen, P. [German rev. of: Blakeslee, A. F. Sexual reactions between her- 

 maphroditic and dioecious mucors. Biol. Bull. 29: 87-102. 3 pi. 1915.] Zeitschr. Bot. 13: 

 532-533. 1921. 



