No. 3, April, 1921] GENETICS 263 



gaster sp. The data show a proportion of mixed broods which cannot be explained in all 

 cases by a deposition of two eggs by two different females or by two kinds of eggs by the 

 same female. The hypothesis of non-disjunction of Bridges is compared with the two-egg 

 hypothesis in the case of Platygaster, which forms all mixed broods having a small propor- 

 tion of males. The final solution must be found through cytological studies. — J. H. Beaumont. 



1818. Phipps, W. H. Blending colors in flowers. Flower Grower 7: 76. 1 fig. 1920.— 

 Article contains chart showing results of mixing different pigments or various spectrum 

 hues and urges hybridizers to use such knowledge in choosing parent plants. Author says, 

 "If you want a cream color you pollinate a white with a light yellow. If a scarlet is desired 

 you will pollinate a red flower with a yellow flower." — -J. P. Kelly. 



1819. Poll, Heinrich. Mischlingstudien VIII. Pfaumischlinge, nebsteinemBeitragzur 

 Kern-Erbtrager-Lehre. [Hybridization studies VIII. Pea-fowl hybrids and a comment on 

 the theory of nuclear bearers of heredity.] Arch. Mikrosk. Anat. 94: 365-458. 5 fig. 1920.— 

 A detailed study of two peacock-guinea-hen hybrids, both males, reared at the Berlin Zoo- 

 logical Gardens. Study includes observations on the living birds and microscopic examina- 

 tion of the testes; also review of other cases and literature on generic crosses in the Phasi- 

 anidae. The peacock-guinea-hen hybrids were very similar, in general intermediate, but so 

 different from either parent that if found wild they would be adjudged new species. They 

 lack both the crest of the peacock and the head wattles of the guinea. Spermatogenesis in 

 the hybrids ends with synizesis; the strepsinema stage is entirely lacking. — 'A large portion of 

 the paper is devoted to a polemic defense of the author's use of the stage of spermatogenesis 

 reached in the hybrids as a measure of the true genetic relationship of the parents. A redefi- 

 nition of terms is given. Applying the method to the Phasianidae, it is concluded that the 

 guinea is more closely related (genetically) to the fowl than to peacock or pheasant (rela- 

 tionship value = 2); and more closely to the peacock (relationship value = 3) than to the 

 pheasant (relationship value = 4). The distances of the fowl from peacock, peacock from 

 pheasant and pheasant from fowl are all placed at 4 as a minimum. — Leon J. Cole. 



1820. Przibram, Hans. Het ontstaan, de inrichting en de werking van het in het Weensche 

 Vivarium ondergebrachte Instituut voor Biologisch Onderzoek. [The origin, organization and 

 work of the Institute for Biological Research brought into the Vivarium of Vienna.] Genetica 

 2:405-450. Sept., 1920. 



1821. Rabatjd, E. Recherches sur I'heredite et la variation. Etude experimentale et 

 theorie physiologique. [Studies on heredity and variation. Experimental study and physio- 

 logical theory.] Bull. Biol. France et Belgique Suppl. 1. 313 p. 1919. [See Bot. Abst. 7, 

 Entry 1838.] 



1822. Rasmusson, H. [German rev. of : Dahlgren, K. V. Ossian. Erblichkeitsversuche 

 mit einer dekandrischen Capsella bursa-pastoris (L). (Genetical investigations with a decan- 

 drous Capsella bursa-pastoris (L).) Svensk. Bot. Tidsskr. 13': 48-60. 2 fig. 1919. (See Bot. 

 Absts. 3, Entry 616.)] Zeitschr. Indukt. Abstamm. u. Vererb. 24: 178-179. Sept., 1920. 



1823. Rasmusson, H. [German rev. of: Kajanus, Birger. Ueber eine Kreuzung 

 zwischen zwei Typen von Sommerweizen. (On the crossing of two types of spring wheat.) 

 Bot. Notiser 1918:245-247. Nov., 1918. (See Bot. Absts 3, Entry 1007.)] Zeitschr. Indukt. 

 Abstamm. u. Vererb. 24: 178. Sept., 1920. 



1824. Renner, Otto. Oenothera Lamarckiana und ihre Bedeutung fiir die Mutations- 

 theorie und fiir die Bastardforschung. [Oenothera Lamarckiana and its significance for the 

 mutation theory and for hybridization studies.] Sitzungsber. Ges. Morph. u. Physiol. Miin- 

 chen31:3-8. 1920. 



