164 
Why study ferns? Nature Study Rev. 19: 185-186. May, 1923. 
Will florists aid to preserve the wild flowers? Gard. Chron. of 
America 27: 155. June, 1923. 
New bud sports in Nephrolepis. Brooklyn Bot. Gard. Contr. 
No. 32. June. (Reprinted from Genetics 8: 75-95. 
January, 1923.) 
Artificial varieties under natural conditions. Can the bud sports 
of the Boston fern thrive under conditions of natural selec- 
tion? Jour. of Heredity 14: 115-116. June, 1923. 
Game laws for the conservation of wild plants. Science 58: 39- 
4a, 4 July 26; tee. 
More fern material used by florists. Amer. Fern Jour. 13: 96- 
97. July-September, 1923. 
The moss-leaved fern. Jour. of Hered. 15: 19-24. January, 
1924. 
The conservation of beauty. Brooklyn Bot. Gard. Leaflets XII1*. 
April 10, 1924. 
Problems in the study of the spinulose ferns. Amer. Fern Jour. 
14: 69-74. July-September, 1924. 
Variation among sporelings of a fertile sport of Boston fern. 
Jour. of Hered. 15: 379-394. September, 1924; 15: 42I— 
431. October, 1924. (Brooklyn Bot. Gard. Contrib. No. 
42.) 
The conservation of beautiy. Brooklyn Bot. Gard. Leaflets 
XII June 10, 1925. 
New plant conservation laws. American Fern Journal 16: 59. 
April-June, 1926. 
Saving the hart’s tongue. American Fern Journal 16: 33-44. 
April-June, 1926. 
Project 7. Experimental Evolution 
Scope: 
To study the possible effect of radium rays in modifying the 
egg-cells and sperm-cells of plants in such a way as to alter in- 
heritance. In order to study the effect of any agent in modify- 
ing inheritance it is necessary to use only pedigreed plants whose 
behavior as to variation and inheritance has been studied during 
a series of generations. Such experimental material is available 
