30 BULLETIN" 521, U. S. DEPARTMENT OF AGEICULTUKE. 
Lesson 39. — Cowpeas. 
Illustrative material : Collection of seed of different varieties of this and 
crops which follow. 
Special references : Cowpeas, Farmers' Bulletin 318 ; Cowpeas in the Cot- 
ton Belt, Office of Secretary of Agriculture Special Circular. 
Lesson 40. — Soy Beans. 
Special reference: Soy Beans, Farmers' Bulletin 372. 
Lesson 41. — Field Peas and Beans. 
Special references. — The following Farmers' Bulletins : 224, Canadian 
Field Peas; 289, Beans. 
Lesson 42. — Peanuts. 
Special reference: The Peanut, Farmers' Bulletin 431. 
Lessons 43 and 4A.—The Clovers. 
Bur, red, crimson, alsike, white, sweet, and any other clovers of 
local importance. 
Illustrative material : Mounted specimens of fresh plants of all varieties 
of clover. Samples of seed of each variety. Same for forage plants 
which follow. 
Special references. — The following Farmers' Bulletins: 123, Red Clover 
Seed ; 441, Lespedeza, or Japan Clover ; 455, Red Clover ; 4S5, Sweet 
Clover ; 550, Crimson Clover : Growing the Crop ; 579, Crimson Clover : 
Utilization; 646, Crimson Clover: Seed Production; 693, Bur Clover; 
730, Button Clover. 
Lesson 45. — Vetches. 
Special references : Hairy Vetch for the Cotton Belt. Office of Secretary 
of Agriculture Special Circular. The following Farmers' Bulletins: 
515, Vetches ; 529, Vetch Growing in the South Atlantic States. 
Lessons 46 and 47. — Alfalfa. 
Special references. — The following Farmers' Bulletins. 339, Alfalfa ; 494, 
Alfalfa Seed Production. 
Exercise 32. — Legume Inoculation. 
Purpose: To give students practice in proper methods of inocula- 
tion. 
Directions : While this exercise may be conducted with seed sown 
in flats in the laboratory, it will have greater value if conducted in 
connection with the seeding of alfalfa or any of the clovers on the 
school farm or the farm of a neighboring patron. In a district where 
any legume which gives promise has not been grown extensively a 
demonstration may be carried out with profit upon plats treated as 
follows: (1) "Without inoculation, (2) inoculated by the soil-transfer 
method, and (3) inoculated by the pure-culture method. Directions 
for applying these methods may be obtained from the United States 
Department of Agriculture, Bureau of Plant Industry Circular 63, 
Methods of Legume Inoculation, or from the Farmers' Bulletins 
which treat the growing of the specific crop. Pure cultures for 
