SEXUALITY 709 



Pringsheim, E. G., and K. Ondracek. 1939. Untersuchungen iiber die 



Geschlechtsvorgange bei Polytoma. Beih. hot. Zbl., 59A: 117-72. 

 Satina, S., and A. F. Blakeslee. 1930. Imperfect sexual reactions in homothallic 



and heterothallic Mucors. Bot. Gaz., 90 (3) : 299-311. 

 Sonneborn, T. M. 1936. Factors determining conjugation in Faramecium 



aurelia. I. The cyclical factor: the recency of nuclear reorganization. 



Genetics, 21: 503-14. 



1937. Sex, sex inheritance and sex determination in Paratnecium 



aurelia. Proc. Nat. Acad. Sci. Wash., 23: 378-85. 



1938a. Mating types in Paramecium aurelia: diverse conditions for 



mating in different stocks; occurrence, number and interrelations of the 

 types. Proc. Amer. Phil. Soc, 79: 411-34. 



1938b. Mating types, toxic interactions and heredity in Paramecium 



aurelia. Science, 88: 503. 



1939a. Sexuality and related problems in Paramecium. Coll. Net, 14: 



77-84. 



1939b. Paramecium aurelia: mating types and groups; lethal inter- 

 actions; determination and inheritance. Amer. Nat. 73: 390-413. 



1939c. Genetic evidence of autogamy in Paramecium aurelia. Anat. 



Rec, 75, (suppl.), p. 85. 



Sonneborn, T. M., and R. S. Lynch. 1934. Hybridization and segregation in 

 Paramecium aurelia. J. exp. Zool., 67: 1-72. 



Stout, A. B. 1938. The genetics of incompatibilities in homomorphic flowering 

 plants. Bot. Rev., 4: 275-369. 



Woodruff, L. L., and R. Erdmann. 1914. A normal periodic nuclear reorgani- 

 zation process without cell fusion in Paramecium. J. exp. Zool., 17: 

 425-518. 



Zweibaum, J. 1921. Richerche sperimentali sulla conjugazione degli Infusori. 

 II. Influenza della conjugazione sulla produzione dei materiali di riserva 

 nel Paramecium caudatum. Arch. Protistenk., AA: 375-96. 



