No. 2, September, 1920] GENETICS 197 



in the organism itself, and beyond all varying somatic responses, could meet demands so con- 

 tinuous and so consistent." According to the author the agency at work possesses a strong 

 determinate influence; and the evidence is of such a nature as to remind one of Nageli's con- 

 ception of a mystical, internal, vitalistic force. In the ostrich, it is suggested that the changes 

 may be interpreted in terms of "a germinal senescence, perhaps expressing itself in factorial 

 fractionation and loss." The author believes that the ostrich race may present us with an 

 example of "mass mutation." — In conclusion, author discusses the possibility of factorial 

 changes, but this point, with reference to the bearing of the ostrich data, is left inconclusive. 

 — P. B. Hadley. 



1491. Elderton, Ethel M. [Rev. of: Whipple, George Chandler. Vital statistics: 

 An introduction to the science of demography. 12 x 18 cm., v + 517 p., 63 fig. John Wiley & 

 Sons, Inc.: New York, 1919.] Science Progress 14: C96-697. April, 1920.— See Bot. Absts. 

 3, Entry 2212. 



1492. Ellinger, Tage. [German rev. of: Punnett, R. C., and the late Major 

 P. G. Bailey. Genetic studies in poultry. I. Inheritance of leg feathering. Jour. Genetics 

 7:203-213. May, 191S. (See Bot. Absts. 1, Entry 492.)] Zeitschr. indukt. Abstamm. Vererb. 

 22: 28S. May, 1920. 



1493. Ellinger, Tage. [German rev. of: Rasmuson, Hans. Uber eine Petunia-Kreuz- 

 ung. (On a petunia cross.) Bot. Notiser 1918: 287-294. 1918. (See Bot, Absts. 3, Entry 

 2181.)] Zeitschr. indukt. Abstamm. Vererb. 22: 289. May, 1920. 



1491. Ellinger, Tage. [German rev. of: Rasmuson, Hans. Zur Genetik der Bliiten- 

 farben von Tropaeolum majus. (On the genetics of the flower colors of Tropaeolum majus.) 

 Bot. Notiser 1918: 253-259. Nov., 1918. (See Bot. Absts. 3, Entry 2180.)] Zeitschr. indukt. 

 Abstamm. Vererb. 22: 288-289. May, 1920. 



1495. Ellinger, Tage. [German rev. of: Ratjnkiaer, C. Om L0vsspringstiden hos 

 Afkommet af B0ge med forskellig L0vspringstid. (On leaftime in the descendants of beeches 

 with different leaf times.) Bot. Tidsskr. 36: 197-203. 1918. (See Bot. Absts. 2, Entry 42.)] 

 Zeitschr. indukt. Abstamm. Vererb. 22 : 289. May, 1920. 



1496. Emerson, R. A. Heritable characters of maize. II. Pistillate flowered maize plants. 

 Jour. Heredity 11: 65-76. 8 fig. Feb., 1920. 



1497. Emoto, Y. Uber die relative Wirksamkeit von Kreuz- und Selbstbefiuchtung bei 

 einigen Pnanzen. [On the relative effectiveness of cross- and self-fertilization in several 

 plants.] Jour. Coll. Sci. Imp. Univ. Tokyo 43: 1-31. 2 pi., 6 fig. Mar. 15, 1920. 



1 !'JS. Erdmann, Rhoda. Endomixis and size variations in pure bred lines of Paramae- 

 cium aurelia. Arch. Entwicklungsmech. Organ. 46: 85-148. 12 fig. 1920. 



1499. Erikson, J. Platanthera bitolia X montana i Blekinge. [Platanthera bifolia X mon- 

 tana in Blekinge.] Bot. Notiser 1918: 59-62. 1918. 



1500. Euler, K. Ein bemerkenswertei- Fall von Knollen-Farbabanderung der Kartoffel. 

 [A remarkable case of change of color in potato tubers.] Deutsch. Landwirtsch. Presse 1919: 

 161-162. 1919. 



1501. Fairchild, David. Twins. Jour. Heredity 10: 387-396. Frontispiece, fig. 1-14, 

 MO, 22-30. Dec, 1919. 



1502. Fleischmann, R. Die Auslese bei der Maisziichtung. [Selection in maize breed- 

 ing.] Zeitschr. Pflanzenzticht, 6: 69-96. 1918. — Selection has been practiced since 1909 on 

 the yellow horse-tooth variety of maize. The characters used were yield of grain, length and 



