No. 2, November, 1920] GENETICS 103 



731. Sirks, M. J. [Dutch rev. of: VAN W issi.i.i -...ii, C. Uber Variabilitat und Erblich- 

 keit. (Variation and heredity.) Ziits.hr. indukt. Abstamra. Vererb. 22: 65-126. 10 fig. 

 Jan., 1920.] Genetica 2: 286-287. May, 1920. 



732. Sirks, M. J. [Dutch rev. of: ZlBOLBB, II. E. Zuchtwahlversuche an Ratten. 

 (Selection experiments on rats.) Fcstschr. 100-jahr. Best. Kgl. Wiirtt. Landw. Ilochschule 

 Hohenheim. p. S85-399. 1919.] Genetica 2: 287-288. May, 1920. 



733. Smith, II. Vegetationen och dess urvecklingshistoria i det central-svenska hog- 

 fjallsomradet. [The vegetation of the central Swedish high-mountain region and the history 

 of its development.] (Inaugural dissertation.) Norrlandskt handbibliotek IX. 185 X 270 



mm., 238 p., 41 fig., 2 maps. Upsala, 1920.— In the list of the vascular plants of this region 

 (Harjedalen and parts of Jamtland) the finding of a great number of hybrids is mentioned, 

 namely: Woodsia alpina X ilvensis, Equisetum trachyodon (= E. hiemale X variegatum), 

 Calamagrostis neglecta X purpurea, Carex brunnescens X Lachenalii, C. canescens X loliacea, 

 C. Goodenoughii X rufina, C. Goodenoughii juncea X rufina, C. aquatilis X Goodenoughii, 

 C. livida X vaginata, C. airala X Halleri, C. flava X Hornschuchiana, C. rotundata X saxa- 

 tilis, Juncus arcticus X filiformis, Luzula confusa X spicata, L. arcuata X spicata, L. sudet- 

 ica X spicata, Orchis cruenta X maculata, Salix caprea X lapponum, S. nigricans X phylici- 

 folia, S. arbuscula X herbacea, S. arbuscula X lapponum, S. arbuscula X reticulata, S. hastata 

 X herbacea, S. hastata X lanata, S. hastata X reticulata, S. glauca X myrsinites, S. glauca X 

 nigricans, S. glauca X phylicifolia, S. myrsinites X nigricans, S. herbacea X lanata, S. her- 

 bacea X lapponum, S. herbacea X reticulata, S. herbacea X polaris, Betula nana X pubescens, 

 Stellaria calycantha X longifolia, Cerastium alpinum X vulgare, Sagina intermedia X Lin- 

 naei, S. Linnaei X procumbens, Melandrium album X silvestre, Draba incana X rupestris, 

 Viola epipsila X palustris, Epilobium anagallidifolium X lactiflorum, E. alsinifolium X 

 palustre, E. Hornemanni X lactiflorum, Euphrasia minima X tenuis, Erigeron borealis X 

 politus. — Interesting is a newly described species Poa hcrjedalica. C. A. M. Lindman has 

 previously called this Poa alpina X pratensis. Most certainly it is produced by such a com- 

 bination. Any viviparous forms have however never been found in this territory. Whether 

 Poa herjedalica is a vegetatively propagated hybrid or a descendant of a hybrid it does not 

 produce any noteworthy capacity for variations or any resemblance to either of the presumed 

 parents. — K. V. Ossian Dahlgren. 



734. Sd, Masao, and Yoshitaka Imai. The types of spotting in mice and their genetic 

 behaviour. Jour. Genetics 9: 319-333. 1 pi. Mar., 1920. — Authors find two independent 

 forms of spotting in mice: (1) Ordinary piebald, s, recessive to self, S; (2) Factor D producing 

 dominant spotting when acting upon self -coated "Kasuri" race. Some factor acting upon 

 piebald spotting produces dark-eyed white "Daruma" type. All mice homozygous for D 

 perish probably during early ontogeny. "Kasuri" race often becomes sterile, especially upon 

 female side, "Daruma" less frequently so. General results confirm previous work of reviewer 

 and of Detlefsen. — C. C. Little. 



735. Tedin, Hans. The inheritance of flower colour in Pisum. Hereditas 1: 68-97. 

 1 colored pi, 2 fig. 1920. 



736. Thomson, J. Arthur. [French rev. of: Dendy, A. Animal life and human progress. 

 8vo, ix + 227 p. Constable & Co. : London, 1919.] Scientia 27: 322-324. 1920. 



737. Thomson, J. Arthur. [French rev. of: Hensen, V. Tod, Zeugung und Vererbung, 

 unter besonderer Beriicksichtigung der Meeresbewohner. (Death, reproduction and heredity 

 with special reference to marine animals.) 84 P-, 20 fig. Lipsius & Tischer: Kiel & Leipzig, 

 1913.] Scientia 14: 487. 1920. 



73S. Tischler, G. Ueber die sogenannten "Erbsubstanzen" und ihre Lokalisation in 

 der pflanzenzelle. [On the so-called hereditary substance and its localization in the plant 

 cell.] Biol. Zentralbl. 40: 15-28. 1920.— See Bot. Absts. 6, Entry 729. 



