152 GENETICS [BoT. Absts., Vol. VIII, 



1058. Anthony, R. D. Asexual inheritance in the violet (Viola odorata). New York 

 Agric. Exp. Sta. [Geneva] Tech. Bull. 76. 55 p., charts 1-10. 1920.— K study was made of the 

 possibility of changing, through a series of selections, stem length and yield of the double 

 violet, Marie Louise {Viola odorata), in order to throw light on the problem of bud selection 

 in pome fruits. Eight hundred plants of this variety, the previous histories of which were 

 unknown, were used as parent plants. Selections were made from these for long stem high 

 yield, long stem low yield, short stem high yield, and short stem low yield, each year. 

 Methods of selecting, corrections for vigor, and corrections for variations due to positions 

 in the house are considered in detail. At the end of 5 years 4 groups had been isolated. Yield 

 for each group was as follows: Long stem high yield, 36.484 =t 0.505; long stem low yield, 

 34.637 ± 0.572; short stem high yield, 40.359 ± 0.569; short stem low yield, 35.389 ± 0.515. 

 Yield is expressed in number of normal flowers. Stem length in each group is as follows: 

 Long stem high yield, 8.920 ± 0.029; short stem high yield, 8.537 ^ 0.040; long stem low 

 yield, 8.483 ± 0.043; short stem low yield, 8.537 ± 0.043. The unit of length was the half 

 inch. All of the plants in each of the 4 groups traced back to a single one of 4 of the original 

 SOO plants. "It follows then that we seemingly have proved only the existence of asexually 

 inherited differences which probably were present before the experiment was begun." — 

 W.D. Valleau. 



1059. Barker, E. Eugene. El mejoramiento de nuestras siembras por la seleccion. 

 [The improvement of our crops by means of selection.] Estacion Exp. Insular Puerto Rico 

 Circ. 30. 24 p. 1920. — Popular account. No new methods presented. — E. E. Barker. 



1060. Bonnet, L. 0. Some observations concerning pollination of olives. Fig and Olive 

 Jour. 4'^: 4. 1920. — Author discusses a one-season study made 20 years ago at Pomona, which 

 indicated that some olive varieties are fully self-fertile and others more or less self-sterile, 

 ' — Howard B. Frost. 



1061. Boulenger, M. F. L'heredite morbide. [Inheritance of disease.] Scalpel 73: 

 669-676. 1920. 



1062. Botjman, K. Herman. Anthropologische Feststellungen iiber die Amsterdamer 

 Schulbevolkerung. [Anthropological discoveries on the school population of Amsterdam.] 

 Nederlandsch. Tidschr, Geneesk. 64: 2374-2383. 1920. 



1063. Bridges, Calvin B. The developmental stages at which mutations occur in the 

 germ tract. Proc. Soc. Exp, Biol. Med. 17 : 1-2. 1919. — Study of critical cases among mutants 

 and mosaics of Drosophila melanog aster has shown that mutation occurred (1) at or near 

 maturation stages in most cases, (2) some time prior to maturation in few cases, (3) during 

 early segmentation stage in few cases, and (4) in zygote immediately after fertilization in 

 some cases (mosaics). — C. W. Metz. 



1064. BuRCH, D, S, Harnessing heredity to improve the Nation's live stock. U. S. Dept. 

 Agric. Year Book 1919: 347-354. 3 fig. 1919. — The advantages to be expected from the 

 use of pure-bred sires in livestock breedings are discussed in connection with the campaign 

 sponsored jointly by the U. S. Department of Agriculture and a majority of the States for 

 "Better Sires— Better Stock."— Sewall Wright. 



1065. CoMBY, J. La tache bleue mongolique chez les enfants europeens. [The blue 

 Mongolian spot on European children.] Arch. Med. Enfants 23: 321-337. 1920. 



1066. Correns, C. Die geschlechtliche Tendenz der Keimzellen gemischtgeschlechtiger 

 Pflanzen. [Sex tendency of germ-cells in plants of mixed sex.] Zeitschr. Bot. 12 : 49-60. 

 2 fig. 1920. — Protonema were obtained by the regeneration from cells of the wall and the 

 stalk of antheridia and archegonia in the monoecious moss Funaria hygromeirica which again 

 produced normal male and female branches. Since such cells are near sister cells of sperms 

 and eggs it is considered that sperms and eggs also possess maleness and femaleness as equal 



