192 INTRODUCTION TO BOTANY 
COLLATERAL READING 
The names Yearbook, Farmers’ Bulletin, Bulletin .. ., Bureau of Plant 
Industry, as used in the list given below, all refer to the publications of 
the United States Department of Agriculture. 
A very detailed list of books and articles on plant breeding will be 
found in Bailey, Plant Breeding. The Macmillan Company, New York. 
Some titles not already referred to in this chapter are as follows :1 
GENERAL 
Yearhook, 1898, “ The Improvement of Plants by Selection.” 
Yearbook, 1906, “ The Art of Seed Selection and Breeding.” 
Farmers’ Bulletin 334, “Plant Breeding on the Farm.” 
Bulletin 167, Bureau of Plant Industry, “New Methods of Plant 
Breeding.” 
Cyclopedia of American Horticulture, article “ Plant Breeding.” The 
Macmillan Company, New York. 
Cyclopedia of American Agriculture, article “Plant Breeding.” The 
Macmillan Company, New York. 
Davenport, The Principles of Breeding. Ginn and Company, Boston. 
SPECIAL 
Farmers’ Bulletin 229, “ Production of Good Seed Corn.” 
Yearbook, 1906, “ Corn-Breeding Work at the Experiment Stations.” 
Yearbook, 1902, “Improvement of Cotton by Seed Selection.” 
Farmers’ Bulletin 342, “ Potato Breeding.” 
PROBLEMS 
1. In which kind of plants — annual, biennial, or perennial — can 
plant-breeding results be most rapidly attained? Why ? 
2. In what kind of plants — those propagated by seeds or those 
propagated by vegetative means—are the results of plant breeding 
most readily perpetuated ? 
3. If yon were asked to originate a new variety of string beans, 
how would you go to work ? 
4. Is plant breeding easier with plants that have many well-defined 
and permanent varieties or with those that haye no such varieties? 
Illustrate. 
1 The number of valuable bulletins published by the agricultural experi- 
ment stations of the several states is so great that no attempt is here made 
to cite them. 
