REPRODUCTION 221 



Schmahl, O.: (1926) Die Neubildung des Peristoms bei der Teilung 

 von Bursaria truncatella. Arch. Protist., 54:359. 



Singh, B. N.: (1941) The influence of different bacterial food sup- 

 plies on the rate of reproduction in Colpoda steini, etc. Ann. 

 Appl. Biol, 27:65. 



(1948) Studies on giant amoeboid organisms. I. J. Gen. Mi- 



crob., 2:8. 



Sokoloff, B.: (1924) Das Regenerationsproblem bei Protozoen. 

 Arch. Protist., 47:143. 



Sonneborn, T. M. : (1937) Sex, sex inheritance and sex determina- 

 tion in Paramecium aurelia. Proc. Nat. Acad. Sc., 23:378. 



(1938) Mating types in Paramecium aurelia, etc. Proc. Am. 



Phil. Soc, 79:411. 



(1939) Paramecium aurelia: mating types and groups, etc. 



Am. Nat., 73:390. 



(1940) The relation of macronuclear regeneration in Para- 

 mecium aurelia to macronuclear structure, etc. Anat. Rec 78: 

 53. 



(1941) The occurrence, frequency and causes of failure to 



undergo reciprocal cross-fertilization, etc. Ibid., 81, Suppl.:66. 



— — — (1942) Sex hormones in unicellular organisms. Cold Spr. 

 Harb. Symp. Quant. Biol., 10:111. 



(1942a) Inheritance in ciliate Protozoa. Am. Nat., 76:46. 



(1943) Gene and cytoplasm. I. Proc. Nat. Acad. Sc, 29: 



329. 



(1943a) II. Ibid., 29:338. 



(1944) Exchange of cytoplasm at conjugation in Paramecium 



aurelia, variety 4. Anat. Rec, 89:49. 



(1947) Recent advances in the genetics of Paramecium and 



Euplotes. Adv. Genetics, 1:263. 



(1950) The cytoplasm in heredity. Heredity, 4:11. 



and Dippell, Ruth V.: (1943) Sexual isolation, mating 



types, and sexual responses to diverse conditions in variety 4, 

 Paramecium aurelia. Biol. Bull., 85:36. 



(1946) Mating reactions and conjugation between 



varieties of Paramecium aurelia, etc. Physiol. Zool., 19:1. 

 Sprague, V.: (1941) Studies on Gregarina blatlarum, etc., 111. Biol. 



Monogr., 18, no. 2. 

 Stein, F.: (1867) Der Organismus der Infusionsthiere. Pt. 2:1. 

 Stolte, H. A.: (1922) Verlauf, Ursachen und Bedeutung der En- 



cystierung bei Blepharisma. Verh. deutsch. zool. Gesell., 27:79. 

 Stuart, C. A., Kidder, G. W. and Griffin, A. M.: (1939) Growth 



studies on ciliates. III. Physiol. Zool., 12:348. 

 Summers, F. M.: (1935) The division and reorganization of the 



macronuclei of Aspidisca lynceus, etc Arch. Protist., 85: 173. 

 (1941) The Protozoa in connection with morphogenetic 



problems. In: Calkins and Summers' Protozoa in biological re- 

 search. 

 Swezy, Olive: (1922) Mitosis in the encysted stages of Entamoeba 



coli. Univ. Calif orina Publ. Zool., 20:313. 

 Tartar, V. and Chen, T. T.: (1941) Mating reactions of enucleate 



fragments in Paramecium bursaria. Biol. Bull., 80:130. 



