No. 1, July, 1920] GENETICS 89 



tures induce variability while periods of inbreeding give opportunities of isolating desirable 



recombinations. Wide crosses should :ipp:uvnt h I ><■ discouraged. Chances for racial stamina 

 6ho\vn to be much greater when ingredients in the Melting Pot are sound at beginning. — 

 H. K. Hayes. 



">7_\ ElSBL, GxiOBO. Zur Kenntnis zweier Formen der Heredodegeneratio nervosa mlt 

 pseudo-bulbarparalytischen Symptomen. [To the knowledge of two forms of heredodegener- 

 atio nervosa with pseudo-bulbal paralytic symptoms.] Inaug. -Dissertation. Rostock, 1918. 



573. Feenstra-Sluiter, C. Waarnemingen en Beschouwlngen over Bloel, Bevruchting en 

 Zaadvorming bij Cinchona Ledgeriana Moens. [Observations and considerations concerning 

 flower, fructification, and seed formation with Cinchona Ledgeriana Moens.] Mededell. Kina 

 Proefsta. Dept. Landb. Nijverbeid en Handel. [Tjinjiroean Java] 6: 1-35. 4 pi-, fig- 1-20. 

 1919.— See Bot. Absts. 4, Entry 986. 



574. Fisher, R. A. The genesis of twins. Genetics 4: 489-499. 2 fig. Sept., 1919.— 

 Thorndike's statistical study of twins shows absence of two distinct categories. Author 

 believes that this demands a new theory of twinning in which heredity is from one gamete 

 only. Suggests that uniovular twinning may be due to double fertilization and accompany- 

 ing fission of egg. Mathematical treatment of the subject. — Chas. B. Davenport. 



575. Florin, Carl, and Rudolf Florin. "P. J. Bergius," en ny applesort. ["P. J. 

 Bergius," a new kind of apple.] Acta Horti Bergiani Stockholm 6 5 : 1-6. 1 pi., 1 fig. 1919. — 

 A scion was taken from an old Safstaholm apple-tree. The branch that was developed from 

 this scion produced fruits which did not show the rosy-colored stripes on green-white ground, 

 which are so characteristic for the Safstaholm apple. The apples were on the contrary colored 

 intensively and uniformly dark red on all sides. A colored picture of this new fruit is attached 

 to the paper. — Scions taken from this new sort of apple-tree have all given apples of the same 

 kind. — The pollen of the new variety has considerably less power of germination than that of 

 the common Safstaholm apple. Parthenocarpy seems not to take place; the "P. J. Bergius" 

 apple ought consequently not to be planted in great groups, but between other sorts of apples 

 with pollen more capable of germination. — K. V. Ossian Dahlgren. 



576. Fries, Thore C. E. Antennaria alpina (L.) Gaertn. och dess skandinaviska element- 

 ararter. [Antennaria alpina and its Scandinavian elementary species.] Svensk Bot. Tidskr. 

 13: 179-193. 1 fig. 1919. — A list of all the rare finds in Scandinavia of d" individuals of the 

 apogamous A. alpina is given. Author has moreover found two of the elementary species 

 described from Greenland, viz., A. intermedia (Rosenv.) Pors. and A. glabrata (J. Vahl) Pors. 

 in Swedish Lapland. Author gives a discussion of the arrival to and spreading in Scandinavia 

 of the o 71 form of A. alpina. Seeds are of course never formed and an effective spreading by 

 means of sterile rosettes or leaves is hardly to be thought of. The possibility that the cf 

 individuals are not constant males in all circumstances, but that certain conditions may 

 induce them to form seeds, is pointed out. The possibility of an "atavistic" production of 

 males from the apogamic 9 individuals is looked upon as rather improbable in the light of 

 modern study of inheritance. — K. V. Ossian Dahlgren. 



577. Fruwirth, C. Zum Verhalten der Bastardierung spontaner Variationen mit der Aus- 

 gangsform. [The behavior of the hybridization of a spontaneous variation with the original 

 form.] Zeitschr. Pflanzenzucht. 7: 66-73. 2 fig. June, 1919.— See Bot. Absts. 4, Entry 2224. 



57S. Gassul, R. Eine durch Generationen pravalierende symmetrische Fingerkontraktur. 

 [A symmetrical contraction of the fingers prevailing through generations.] Deutsch. med. Woch- 

 enschr. 44: 1197-1198. 2 fig. 1918.— See also Bot. Absts. 4, Entries 2229, 2230. 



579. Gervais, Prosper. [Rev. of: Rouart, Eugene, and Louis Rives. Les hybrides 

 producteurs directs pour la reconstitution du vignoble. (The hybrid direct-producers for the 

 reconstitution of viticulture.)] Compt. Rend. Acad. Agric. France 5: 293-297. 1919. 



