104 GENETICS [Bot. Absts., Vol. VI, 



739. Tischler, G. [German rev. of: de Vries, Eva. Versuche iiber Frucht- und Samen- 

 bildung bei Artkreuzungen in der Gattung Primula. (Studies on fruit and seed formation 

 in species crosses in the genus Primula.) Recueil Trav. Bot. Neerlandais 16: 63-205. 1919.] 

 Zeitschr. Bot. 12: 169-171. 1920. 



740. Tjebbes. [Dutch rev. of: von Hofsten, N. Arftlighetslara. (Genetics.) 17 X 

 26 cm., viii + 506 p., 191 fig., 1 colored pi. P. A. Norstedt & Soners forlag: Stockholm, 1919. 

 (See Bot. Absts. 3, Entry 2208.)] Genetica 2: 263-264. May, 1920. 



741. Tjebbes. [Dutch rev. of: Winge, 0. Om Nedarvningen af Hestend L0d. (Inher- 

 itance of coat color in cattle.) Nordisk Jordbrugsforskning 1920: 1-30. 1920.] Genetica 2: 

 284-285. May, 1920. 



742. Torsell, R. Iakttagelser rorande den s. k. slidsjukans upptradande a hostvete vid 

 Ultuna sommaren 1918. [Observation of the disease caused by Cicadula sexnotata, appearing 

 on wheat at Ultuna in the summer of 1918.] Sveriges Utsadesf. Tidskr. 28: 260-274. 1918.— 

 Between different kinds of winter wheat there are differences in their resistance against the 

 disease, — for each kind a particular resistance, apparently transmissible to the descendants. 

 The power of resistance, seems to be directly influenced by different qualities, specially con- 

 cerning the winter-hardiness. The most effective way to avoid the disease in question is to 

 grow resistant and highly hardened sorts of wheat. [See also Bot. Absts. 6, Entry 746.] — 

 K. V. Ossian Dahlgren. 



743. van der Wolk, P. C. Eine neue Phase der experimentellen Entwicklungslehre. [A 

 new phase of experimental evolution.] Umschau. 1920: 63-66. 1920. 



744. van Herwerden, M. A. [Dutch rev. of: (1) Calkins, G. N., and L. H. Gregory. 

 Variations in the progeny of a single ex-conjugant of Paramaecium caudatum. Jour. Exp. 

 Zool. 15: 467. 1913. , (2) Stocking, R. J. Variation and inheritance in abnormalities occur- 

 ring after conjugation in Paramaecium caudatum. Ibid. 19: 387. 1915. (3) Middleton, A. 

 R. Heritable variations and the results of selection in the fission rate of Stylonychia pustulata. 

 Ibid. 19: 451. 1915. (4) Hegner, R. W. Variation and heredity during the vegetative repro- 

 duction of Arcella dentata. Proc. Nation. Acad. Sci. [U. S. ] 4 : 283-288. Sept. , 1918. (See Bot. 

 Absts. 2, Entry 676.) (5) Ackert, J. E. Effect of selection of Paramaecium. Genetics 1: 

 407. 1916. (6) Jennings, H. S. Heredity, variation and the results of selection in Difflugia 

 corona. Ibid. 1 : 407-534. 1916. (7) Erdmann, R. Endomixis and size variations in pure 

 lines of Paramaecium aurelia. Proc. Soc. Exp. Biol. Med. 16: 60-65. 1919. (See Bot. Absts. 

 3, Entry 2123.)] Genetica 2: 244-248. May, 1920. 



745. van Herwerden, M. A. [Dutch rev. of: Goldschmidt, R. Intersexualitat und 

 Geschlechtsbestimmung. (Intersexuality and sex determination.) Biol. Zentralbl. 39: 498- 

 512. Nov., 1919.] Genetica 2 : 257. May, 1920. 



746. Wahlstedt, I. Iakttagelser rorande slidsjukans upptradande a hostvete i Oster- 

 gottland sommaren 1918. [Observations concerning the disease caused by Cicadula sexnotata 

 on winter wheat in OstergStland.] Sveriges Utasdesf. Tidskr. 28: 195-215. 1 fig. 1918. — 

 Different varieties of fall wheat show different resisting power against attacks of Cicadula 

 sexnotata. [See also Bot. Absts. 6, Entry 742.] — K. V. Ossian Dahlgren. 



747. Welch, Paul S. [Rev. of : Patterson, J. T. Polyembryony and sex. Jour. Hered- 

 ity 10: 344-352. 2 fig. Nov., 1919.] Trans. Amer. Microsc. Soc. 39: 164-165. April, 1920. 



748. Winge, 0. Om Nedarvningen af Hestend L0d. [Color inheritance in cattle.] Nord- 

 brungsforskning 1920: 1-30. 1920.— See Bot. Absts. 6, Entry 741. 



749. Winkler, H. Verbreltung und Ursache der Parthenogenesis in Pflanzen- und Tier- 

 reiche. [Distribution and cause of parthenogenesis in the plant and animal kingdoms.] 8vo, 

 vi + 281 p. Gustav Fischer: Jena, 1920. 



