344 THE THEORY OF THE GENE 



1923. Geschlechtschromosomen-Untersuchungen an Psychiden. IV. Die 



Parthenogenese der Psychiden. Zeit. Abst.-Vererb. XXXI. 

 SeiLiER, J., und Haniel, C. B. 1922. Das verschiedene Verhalten der Chro- 



mosomen in Eireifung und Samenreifung von Lyniantria monacha L. Zeit. 



Abst.-Vererb. XXVII. 

 Serebrovsky, a. S. 1922. Crossing-over involving three sex-linked genes in 



chickens. Am. Nat. LVI. 

 Sexton, E. W., and Huxley, J. S. 1921. Intersexes in Gammarus cheureuxi 



and related forms. Jour. Marine Biol. Assn. United Kingdom. XII. 

 Sharp, L, W. 1921. An introduction to cytology. New York. 

 Shimotomai, N. 1925. A karyological study of Brassica I. Bot. Mag. Tokyo, 



XXXIX. 

 Shiwago, p. J. 1924. The chromosome complexes in the somatic cells of 



male and female of the domestic chicken. Science. LX. 

 Shull, a. F. 1910. Studies in the life cycle of Hydatina senta. Jour. Exp. 



Zool. VIII. 



1915. Inheritance in Hydatina senta. II. Characters of the females 



and their parthenogenetic eggs. Jour. Exp. Zool. XVIII. 



1915. Periodicity in the production of males in Hydatina senta. Biol. 



Bull. XXVIII. 



— 1917. Sex determination in Anthothrips verbasci. Genetics, II. 



— 1921. Chromosomes and the life cycle of Hydatina senta. Biol. Bull. 

 XLI. 



1925. Sex and the parthenogenetic-bisexual cycle. Am. Nat. LIX. 



Shull, A. P., and Ladoff, Sonia. 1916. Factors affecting male-production 



in Hydatina. Jour. Exp. Zool. XXI. 

 Shull, G. H. 1909. The "presence and absence" hypothesis. Am. Nat. 



XLIII. 



1910. Inheritance of sex in Lychnis. Bot. Gaz. XLIX. 



■ 1911. Eeversible sex-mutants in Lychnis dioica. Ibid. LII. 



1912. Hermaphrodite females in Lychnis dioica. Science. XXXVI. 



1914. Duplicate genes for capsule-form in Bursa bursa-pastoris. Zeit. 



Abst.-Vererb. XII. 



1923. Further evidence of linkage with crossing over in Oenothera. 



Genetics. VIII. 



1923. Linkage with lethal factors in the solution of the Oenothera 



problem. Eugenics, Genetics and the Family. I. 



SiNNOTT, E. W., and Blakeslee, A. F. 1922. Structural changes associated 



with factor mutations and with chromosome mutations in Datura. Proc. 



Nat. Acad. Se. VIII. 

 SiNOTO, Y. 1924. On the chromosome behaviour and sex determination in 



Eumex acetosa L. Bot. Mag. Tokyo, XXXVIII. 

 Smith, Geoffrey. 1906. Fauna und Flora des Golfes von Neapel. Ehizo- 



cephala. Zool. Sta. Neapel. Monographie. XXIX. 



1909. Crustacea. Cam. Nat. Hist. 



1910-1912. Studies in the experimental analysis of sex. Parts 1-9. 



Quar. Jour. Micro. Sc. LIV, LV, LVI, LVII, LVIII. 



1913. Studies in the experimental analysis of sex. 10. The effect of 



Sacculina on the storage of fat and glycogen and on the formation of 

 pigment by its host. Ibid. LIX. 



