254 , GENETICS [BoT. Absts., Vol. VII, 



1760. Haecker, V. tJber weitere Zusammenhange auf dem Gebiete der Mendelforsch- 

 ung. [On further correlations in the field of Mendelian investigation.] Pfliiger's Arch. 

 Gesamte Physiol. 181 : 149-169. 1920. 



1761. Hansen, W. Die Mahndorfer Pflanzenziichtung bzw. das Mahndorfer Usancen- 

 buch. [The Mahndorf plant-breeding or the book of Mahndorf methods.] Zeitschr. Pflanzen- 

 zucht. 7: 283-318. 5 fig. Nov., 1920. 



1762. Harland, S. C. Inheritance in Dolichos lablab, L. Part I. Jour. Genetics 10: 

 219-226. Oct., 1920.— Two white-flowered varieties of the bonavist were crossed. The 

 anthers open before the flowers, and bagging was therefore omitted. The character of indefi- 

 nite growth was proved a Mendelian dominant to the bush habit. One variety had no visible 

 anthocyan; the other had purple in the seed-coat and hairs of the stipules. Fi had purple 

 flowers, nodes, and leaf -ribs, with black seeds. In F2 the ratio by flower-color was 9:7, as 

 was confirmed in subsequent generations. By seed-color, the ratio in F2was 9:3:4. — John 

 Belling. 



1763. Harman, Mary T. Chromosome studies in Tettigidae. II. Chromosomes of 

 Paratettix BB and CC and their hybrid BC. Biol. Bull. 38: 213-230. 3 pi. April, 1920.— 

 Cytological observations on spermatogenesis in grouse locusts used by R. K. Nabours in 

 genetical work. Chromosomes of form BB are like those of CC except that one pair ("the 

 third pair") is hook-shaped instead of straight. Hybrid BChas one hooked and one straight 

 chromosome in third pair. Author describes end-to-end union of chromosomes with "not 

 . . . . the least appearance of a side-by-side pairing" in growth period. Believes lack of 

 crossing over in Paratettix is explained by absence of parasynapsis. Suggests that in Apo- 

 tettix where crossing over occurs parasynapsis may occur. — C. W. Metz. 



1764. Hart, C. tJber die Vererbung erworbener Eigenschaften. [On the inheritance of 

 acquired characters.] Berlin. Klin. Wochenschr. 57: 65^656. 1920. 



1765. Hayes, H. K., and Harry V. Harlan. The inheritance of the length of internode 

 in the rachis of the barley spike. U. S. Dept. Agric. Bull. 869. 26 p., 2 pi, 2 fig. Sept. 30, 

 1920. — 'Extensive data bearing on the inheritance of length of rachis internode in crosses 

 between pure lines of barley is given. Four dense and six lax or semi-lax sorts were used. 

 In Fi density is dominant or semi-dominant. In F2 the range of variability includes the 

 modal class of both parents. In F3 homozygous strains were isolated similar to either parent. 

 In three crosses types homozygous for intermediate densities were also obtained. The author 

 interprets his results on the factor basis, assuming one, two, or more factors as the specific 

 cases warrant. The significance of the constancy of internode length as an aid to barley class- 

 ification is noted. — F. P. Bussell. 



1766. Hayes, H. K., John H. Parker, and Carl Kurtzweil. Genetics of rust resist- 

 ance in crosses of varieties of Triticum vulgare with varieties of T. durum and T. dicoccum. 

 Jour. Agric. Res. 19: 532-542. 6 pi. Sept., 1920. — 'Inheritance studies are reported on rust 

 resistance as correlated with certain botanical and morphological characters in crosses between 

 common wheats and resistant pure-line strains of durum and emmer. Earlier work pre- 

 sented difiSculties of interpretation due to the presence of different biologic strains of rust. 

 Parent strains of wheat together with F2 and F3 generation material were inoculated with a 

 pure strain of Puccinia graminis tritici. The durum X common cross gave susceptible Fi, 

 while emmer X common showed resistance partially dominant, therefore, reciprocal crosses 

 behaved similarly. There was some indication of linkage between both durum and emmer 

 head characters and resistance to rust infection. A few crossovers giving resistant com- 

 mon-wheat types were obtained. The mode of inheritance of rust resistance is interpreted 

 as Mendelian. — F. P. Bussell. 



1767. Herlant, Maurice. Un cas d'hermaphrodisme complet et fonctionnel chez Para- 

 centrotus lividus. [A case of complete and functional hermaphroditism in Paracentrotus 



