12 T O R R E Y A 



sideration of the complete life cycle as a sexual process may focus attention 

 more forcefully on the genetical aspects of chromosome behavior and may 

 serve to modify their ''prolonged and prayerful consideration" in the direction 

 of greater simplicity and proper scientific evaluation. 



Department of Botany, The Pennsylvania State College 

 State College, Pennsylvania 



Literature Cited 



Allen, C. E. 1932. Sex-inheritance and sex-determination. Amer. Nat. 66: 97-107. 



Barkley, Fred A. 1939. Keys to the Phyla of Organisms. Missoula, Mont. : Associated 

 Student's Stores. 



Campbell, D. H. 1918. The Structure and Development of Mosses and Ferns. 2nd. ed. New 

 York : The Macmillan Company. 



Chamberlain, C. J. 1905. Alternation of generations in animals from a botanical stand- 

 point. Bot. Gaz. 39: 137-144. 



1930. Elements of Plant Science. New York: McGraw-Hill Book Co. 



Copeland, Herbert F. 1938. The kingdoms of organisms. Quart. Rev. Biol. 13: 383-420. 



Coulter, J. M. 1914. Evolution of Sex in Plants. Chicago : Univ. of Chicago Press. 



Davis, B. M. 1903. The origin of the sporophyte. Amer. Nat. 37: 411-429. 



Douglas, Gertrude E. 1944. The inferior ovary. Bot. Rev. 10: 125-186. 



Fritsch, F. E. 1916. The algal ancestry of the higher plants. New Phytologist 15: 233- 

 250. 



> — • 1920. Thalassiophyta and the algal ancestry of the higher plants. New Phytologist 



20: 165-178. 



1935. The Structure and Reproduction of the Algae. New York : The Macmillan 



Company. 



Loehwing, W. F. 1938. Physiological aspects of sex in angiosperms. Bot. Rev. 4: 581- 

 625. 



Sharp, Lester, W. 1925. The factorial interpretation of sex-determination. La Cellule 35: 

 193-235. 



■ 1934. Introduction to Cytology. New York: McGraw-Hill Book Co. 



Smith, G. M. 1933. The Fresh-water Algae of the United States. New York : McGraw- 

 Hill Book Co. 



. — -1938a. Cryptogamic Botany. Vol. 1. Algae and Fungi. New York: McGraw-Hill 



Book Co. 



1938b. Cryptogamic Botany. Vol. 2. Bryophytes and Pteridophytes. New York: 



McGraw-Hill Book Co. 

 , Gilbert, E. M., Evans, R. I., Duggar, B. M., Bryan, G. S. and Allen, C. E. 



1942. A Textbook of General Botany. 4th ed. New York: The Macmillan Co. 

 Svedelius, Nils. 1927. Alteration of generations in relation to reduction division. Bot. 



Gaz. 83 : 362-384. 

 Tilden, Josephine E. 1935. The Algae and their Life Relations. Minneapolis, Minn. : 



The Univ. of Minnesota Press. 

 Tippo, Oswald. 1942. A modern classification of the plant kingdom. Chron. Bot. 7: 203- 



206. 

 Transeau, E. N., Sampson, H. C, and Tiffany, L. H. 1940. Textbook of Botany. New 



York : Harper and Brothers. 

 Weatherwax, Paul. 1942. Plant Biology. Philadelphia, Pa. : W. B. Saunders Co. 



