214 GENETICS [Bot. Absts. 



1508. Siemens, H. W. [Rev. of : Wegelin, Prof. Carl. Uber eine erbliche Missbildung 

 des kleinen Fingers. (On an hereditary abnormality of the little finger.) Berliner Klin. 

 Wochensch. 54: 1917.] Zeitschr. indukt. Abstamm. Vererb. 20: 159. Jan., 1919. 



1509. Sirks, M. J. [Rev. of: j^agedoorn, A. L., and A. C. Rattensoorten. (Rat 

 species.) Teysmannia 28: 1-23. 1917.] Zeitschr. indukt. Abstamm. Vererb. 20: 160. 

 Jan., 1919. 



1510. Sirks, M. J. [Rev. of: Kajantjs, B., and S. O. Berg. Pisum-Kreuzungen. (Pea 

 crosses.) Arkiv Bot. 15: 1-18. 1919.] Genetica 1: 470-471. Sept., 1919. 



1511. Sirks, M. J. [Rev. of : Morgan, T. H. Heredity and sex. 284 V-, 1%1 fiti- Colum- 

 bia University Press: New York, 1914.] Genetica 1: 485-486. Sept., 1919. 



1512. Sirks, M. J. [Rev. of: Tjebbes, K. Sur les rapports genetique entre Thaumalea 

 picta et Thaumalea obscura Schlegel. D'apres les etudes experimentales de M. le Dr. J. H. 

 Kruimel. (Uber die genetischen Beziehungen zwischen Thaumalea picta und Thaumalea 

 obscura Schlegel.) (On the genetical agreement between Thaumalea picta and S. obscura 

 Schlegel. From an experimental investigation of Dr. J. H. Kruimel.) Arch. N6erland. Sci. 

 Exactes et Nat. Ill B, 3: 316-323. 1917.] Zeitschr. indukt. Abstamm. Vererb. 20:175-176. 

 Jan., 1919. 



1513. Sirks, M. J. [Rev. of: Ziegler, H. E. Die Vererbungslehre in der Biologie und 

 in der Soziologie. [Genetics in biology and sociology.] xvi + 480 p., 8 (partly colored) pi., 

 Ill fig. Gustav Fischer: Jena, 1918. (See Bot. Absts. 2, Entry 963.)] Genetica 1: 496. 

 Sept., 1919" 



1514. S6, M., and Y. Imai. Daikon no Iden Hokoku ni taisuru Nohara Udi no Hihyo ni 

 tuite. [On the critique of Mr. Nohara against our report on the inheritance of Raphanus sativa.] 

 [Japanese]. Bot. Mag. Tokyo 33 (Japanese part) : 172-173. 1919. — Against the opinion of 

 Nohara (See Bot. Absts. 3, Entry 1500), authors think that their work on the inheritance of 

 Raphanus is not explainable on the basis of the action of a lethal factor. They do not, how- 

 ever, try to explain the results of their work. — S. Ikeno. 



1515. Stein, E. [Rev. of: de Vries, H. Die endemischer Pflanzen auf Ceylon und die 

 mutierenden Oenofheren. (The endemic plants of Ceylon and the mutating Oenotheras.) 

 Biol. Centralbl. 36: 1-11. 1916.] Zeitschr. indukt. Abstamm. Vererb. 20: 176. Jan., 1919. 



1516. Stoll, Norman, R., and A. Franklin Shull. Sex determination in the white fly. 

 Genetics 4:251-260. May, 1919. — Breeding experiments with "white fly," A leurodes vapor- 

 ariorum, show that virgin females yield males; mated females, both sexes. In three cases 

 male ratio from mated females was very low, disproving theory that fertilized eggs yield 

 males and females in equal numbers. Male offspring produced by mated females are assumed 

 to result from parthenogenetic development of unfertilized eggs, and it is concluded that 

 fertilized eggs yield females; unfertilized, males.— B. Wolf, Jr. 



1517. Stout, A. B. Intersexes in Plantago lanceolata. Bot. Gaz. 68: 109-133. PL 

 12-18. Aug., 1919. — The observations reported refer almost entirely to maleness. There 

 is a wide variation in the development of stamens among different plants, among various 

 flowers of the same spike or even among stamens of a single flower. Functionally the varia- 

 tion ranges from pure maleness to pure femaleness. The stamens of pure male flowers are 

 generally, but not necessarily, well developed, pollen grains germinate normally but flowers 

 do not set any seed, neither when selfed nor cross-pollinated, pistils are present but they are 

 impotent. In intermediates the filaments are not as well developed as in pure males but 

 anthers make pollen grains which are not viable, pistils are potent and set good seeds. In 

 pure females stamens vary in development from traces of the four anthers to fully sterile 



