No. 1, July, 1920] GENETICS 103 



634. Klbbahn, [H.]. [Rev. of : Davis, Bradley Moobe. Hybrids of Oenothera biennis 

 and Oenothera franciscana in the first and second generation. Genetics 1: 107-221. 1916.] 

 Zeitschr. indukt. Absl.-mim. Vererb. 21: 138 I 10. July, l'.M'.i. 



635. KLBBAHN [H.]. [llev. of: STOMPS, Thbo. J. Uber den Zusammenhang zwischen 

 Statur und Chromosomenzahl bei den Onotheren. (On the correlation between stature and 

 chromosome number in the Oenotheras.) Biol. Centralbl. 36: 120-160. 1916.] Zeitschr. 

 indukt. Abstamm. Vcrerb. 21: 140-112. July, 1919. 



636. KooiMAN, H. N. Over de beteekenis van het kruisen van individuen, behoorend tot 

 verschillende Linne'sche soorten, voor het ontstaan onzer huisdieren. [On the significance of 

 crossing of individuals belonging to different Linnean species, for the origin of our domestic 

 animals.) Ardea 7: 108-114. 1918.— The fertility of hybrids between different Linnean 

 species is generally denied or doubted; Darwin thought hybrids between species of Callus 

 infertile, as did many fowl-breeders in later years. Experiments in crossing the Linnean 

 species Gallus bankiva with G. sonnerati and G. bankiva with O. furcatus, made by Houwink 

 at Meppel, have shown to the writer the occurrence of fertile hybrids between these species, 

 the fertility being of course somewhat more limited than in "pure" individuals. But the 

 principal result is, that the hybrids are fertile, that functioning gametes are being formed 

 by the Fi animals and that vital F 2 -animals may be obtained. Perhaps the results of these 

 experiments show us the possibility of obtaining anew various races of domestic fowl by 

 cross-breeding the wild Linnean species and thus to build their genealogical tree in a sense, 

 not Lamarckian or Darwinian or deVriesian, that supposes all only one Linnean species as the 

 ancestor of our domestic animals, but in a sense of crossing: two or more Linnean species may 

 have contributed to the origin of our domestic varieties. — M. J. Sirks. 



637. Krause, K. [Rev. of : Raunkiaer, C. tiber den Begriff der Elementarart im Lichte 

 der modernen Erblichkeitsforschung. (On the concept of elementary species in the light of 

 modern genetical investigations.) Zeitschr. indukt. Abstamm. Vererb. 19:225-240. 2 fig. 

 1918. (See Bot. Absts. 2, Entry 41).] Bot. Jahrb. 55:68. 1919. 



638. Kruger. [Rev. of: Cockayne, E. A. "Gynandromorphism" and kindred problems. 

 Jour. Genetics 5:75-131. PI. 21-24. 1915.] Zeitschr. indukt. Abstamm. Vererb. 22 : 55-57. 

 Dec, 1919. 



639. Kuiper, [K.] [Rev. of: Schmidt, Johs. Racial studies in fishes. I. Statistical 

 investigations with Zoarces viviparus L. Jour. Genetics 7: 105-118. 1918.] Genetical: 557- 

 558. Nov., 1918. 



640. Kuttner, O. [German rev. of: Ekman, Sven. Studien iiber die marinen Relikte 

 der nordeuropaischen Binnengewasser. II. Die Variation der Kopfform bei Limnocalanus 

 grimaldii (de Guerne) und L. macrurus (G. O. Sars). (Studies on the marine relicts of north 

 European inland waters. II. The variation of the headform in Limnocalanus grimaldii (de 

 Guerne) and L. macrurus (G. O. Sars). Intern. Rev. d. ges. Hydrobiol. u. Hydrographie 6: 

 1913.] Zeitschr. indukt. Abstamm. Vererb. 21: 181-182. Sept., 1919. 



641. Kuttner, O. [German rev. of : Hartmann, Otto, tiber das Verhaltnis von Zellkern 

 und Zellplasma bei Ceratium und seine Bedeutung fur Variation und Periodizitat. i. On the 

 relation between nucleus and cytoplasm in Ceratium and its significance for variation and 

 periodicity.) Arch. Zellforsch. 14:1916.] Zeitschr. indukt. Abstamm. Vererb. 21:182-1S3. 

 Sept., 1919. 



642. Kuttner, O. [German rev. of : Heuscher, H. Das Zooplankton des Zurichsees mit 

 besonderer Beriicksichtigung der Variability einiger Planktoncladoceren. (The zooplankton 

 of Zurich lake with special reference to the variability of some plankton Cladocera.) Arch. 

 Hydrobiol. Planktonkunde 11:1916.] Zeitschr. indukt. Abstamm. Vererb. 21:180-181. 

 Sept., 1919. 



