No. 4, January, 1921] GENETICS 249 



immediate progeny in its development the less effective is thai pollen in ilishing tlie 



union." The experiments with maize involved the classifical ion of 63,1 ng from 



the use of 22 pollen mixtures, obtained from twelve strains. Of the 20 m xtures which were 

 analyzed on seed characters alone, 17 showed selective fertilization in favor of the plant's 

 own pollen, while three of the mixtures showed the opposite effect. S milar results were 

 obtained in Lycopersicinn esculentum, but the data were not so extensive. The author attrib- 

 utes the differential fertilization to the more rapid growth of pollen tubes in the stigmas of 

 the parent plant and BUggests anaphylaxis as a possible cause of the selective action. — J //. 

 Ki mpton. 



1700. Jones, D. F. Selective fertilization in pollen mixtures. Proc. Nat on. Aca 1. 

 Sci. IT. S. 6: 66-70. Feb., 1920.— Pollen of A and B types of corn was thoroughly mixed and 

 applied to silks of both A and B. Resulting ears showed mixtures of hybrid and self-fertilized 

 seed, distinguishable by endosperm characters. Ratio of sclfed to crossed seeds on A ears 

 should have had same value as ratio of crossed to selfed on B, provided no selective pollina- 

 tion occurred. In 20 extensive experiments, results of 3 showed foreign pollen favored 17 

 showed own pollen favored, 15 of which were unquestionably significant. Less extensive 

 exper ments on tomato gave similar but not conconclusive results. Results were surprising 

 in view of advantages of hybrid vigor. It was further shown that the wider the cross, the 

 more was own pollen favored; "in proportion as the cross-fertilization benefits the progeny, 

 the less effective are the germ cells in accomplishing fertilization." Results were the same 

 irrespective of vigor or heterozygosity of parents used. Idea is refuted that union of d verse 

 sexual elements stimulates growth through upsetting balance in protoplasm; instead, hybrid 

 vigor is explained on basis of pure inheritance. Other things being equal, it is homogeneity 

 in protoplasmic structure that favors highest developmental efficiency. — Merle C. Coulter. 



1701. Jones, D. F. [Rev. of: Coulter, John M., and Merle C. Coulter. Plant 

 genetics. 13X19 cm., ix + 214 p., 40 fig. Univ. Ch cago Press: Chicago. July, 1918. 

 (See Bot. Absts. 2, Entry 395.)] Science 48: 346-347. Oct. 4, 1918. 



1702. Just, Gunther. Der Nachweis von Mendel-Zahlen beim Formen mit nisdriger 

 Nachkommenzahl. Eine empirische Priifung der Geschwister- und Probandenmethode V/eis- 

 bergs auf Grund von Kreuzungsversuchen mit Drosophila ampelophila Low. [The determina- 

 tion of Mendelian ratios in forms with low number of offspring. An empirica test of Weis- 

 berg's methods on the basis of crossing experiments with Drosophila ampelophila Low.' Arch. 

 Mikros. Anat. 94:604-652. 1920. 



1703. Kalt, B. Der Begr'ff "Origina'saatgut" und seine Anwendung bei der Ziich- 

 tungsanerkennung. [The concept "original seed" and its application in the recognition of 

 breeding.' Fuhlings Landwirtsch. Zeit. 1919: 460-471. 1919. 



1704. Kammerer, Paul. Dunkeltiere im Licht und Lichttiere im Dunke'.. | Darkness 

 animals in light and light animals in darkness.] Naturwissenschaften 8: 28-35. 1920. 



1705. Kiessling, L. 11. Bericht der bayrischen Landessaatzuchtanstalt in We hen- 

 stephan. (1914-1918). [11th report of the Bavarian Seed-breeding Institution at Weihen- 

 stephan (1914-1918). Landw. Jahrb. f. Bayern 1919: 1-178. 1919.— General report for years 

 1914-1918 presented under seven following headings: (1) History of institution, in connection 

 with which is given picture of C. Kraus, founder. (2) Researches of institution: accounts 

 of breeding work presented here and of agreements concerning delivery of pedigreed seed- 

 stock for increase or further breeding. (3) Extension work and publications. (4) Bavarian 

 seed-breeding localities; given here are principles governing creation of increase stations. 

 (5) Section on promotion of seed-growing, where statistics on variety classification at cer- 

 tain places and where discussion of stations for culture of potato and vegetable seeds are 

 given. (6) Agricultural promotion work. (7) Associational work of district agricultural 

 societies, of Bavarian Seed-breeding Union and of Beet ("Ruben") Breeding Union. [Pre- 

 pared from anonymous review in Zeitsohr. Pflanzcnzacht. 7: 213-214. June 1920.]— J. P. 

 Kelly. 



