328 SEX IN MICROORGANISMS 



REFERENCES 



Anderson. T. F. 1950. A new technique for the study of biological structures 



in the electron microscope. Biol. Bull., 99, 315. 

 Barron, E. S. G. 1951. Thiol groups of biological importance. Advances in 



EnzymoL, 11, 201. 

 Beale, G. H. 1951. Antigen variation in Faratnecium aurelia, variety 1. Gene- 

 tics, 37, 62. 

 Berg, W. E. 1950. Lytic effects of sperm extracts on the eggs of Mytilus edulis. 



Biol. Bull, 98, 128. 

 Bernheimer, A. W., and J. A. Harrison, 1941. Antigenic differentiation among 



strains of Parameciu?n aurelia. J. hnmunoL, 41, 201. 

 Bielig, H. J. and F. von Medem. 1949. Wirkstoffe der tierischen Befruchtung. 



Experientia, 5, 11. 

 Boell, E. J., and L. L. Woodruff. 1941. Respiratory metabolism of mating 



types in Faraineciufn calkinsi. J. Exptl. Zoo/., 87, 385. 

 Chambers, R. 1930. The manner of sperm entry in the starfish egg. Biol. Bull., 



58, 344. 

 Chang, M. C, and G. Pincus. 1951. Physiology of fertilization in mammals. 



Physiol. Revs., 31, 1. 

 Chargaff, E. 1944. Lipoproteins. Advances in Protein Chem., 1, 1. 

 Chen, T. 1940a. Conjugation of three animals in Paramecium bursaria. Proc. 



Natl. Acad. Sci. U. S., 26, 231. 

 . 1940b. Conjugation in Pararnecium bursaria between animals with 



diverse nuclear constitutions. /. Heredity, 31, 185. 

 . 1940c. Conjugation in Para?7jecium bursaria between animals with very 



different chromosome numbers and between animals with and without 



micronuclei. Proc. Natl. Acad. Sci. U. S., 26, 243. 

 . 1945. Induction of conjugation in Parameciwn bursaria among animals 



of one mating type by fluid from another mating type. Proc. Natl. Acad. 



Sci. U. S., 31, 404. 

 . 1946a. Varieties and mating types in Paramecium bursaria. L New 



variety and types, from England, Ireland, and Czechoslovakia. Proc. Natl. 



Acad. Sci. U. S., 32, 173. 

 . 1946b. Conjugation in Para?neciu?n bursaria. I. Conjugation of three 



animals. /. Morphol, 78, 353. 

 . 1946c. Conjugation in Paramecium bursaria. II. Nuclear phenomena 



in lethal conjugation between varieties. /. Morphol., 79, 125. 



1946d. Temporary pair formation in Paramecium bursaria. Biol. Bull., 



91, 112. 



Chen, Y. T. 1944. Mating types in Parajnecium caudatum. Am. Naturalist, 78, 

 334. 



Cleland, K. W., and L. Rothschild. 1952. The metabolism of the sea-urchin 

 &g^. J. Exptl. Biol, 29, 285. 



Dan, J. C. 1950. Sperm entrance in echinoderms, observed with the phase con- 

 trast microscope. Biol. Bull, 99, 399. 



