xvi. CONTENTS 



of Weeds. 321. The Cost of Insects. 322. The Loss 

 from Rust. 323. The Amount Hail Takes from the Pro- 

 fits. 324. The Moral. 325. The Cost of Production 

 and the Selling Price. 326. The State's Third of the Prob- 

 lem that of a Permanent Agriculture. 327. Factors 

 that Affect Permanence. 328. The Means at Man's Dis- 

 posal for Controlling or Influencing the Factors of 

 Growth, Profit and Permanence. 329. The Choice of 

 Suitable Crops. 330. Suitable Crop Management Prac- 

 tices. 331. The Improvement of Crops. 332. Irriga- 

 tion and Drainage. 333. Tillage. 334. Crop Rotations. 

 335. Crop Rotations and Live Stock. 336. Business 

 Farming. 337. legumes and Inoculation. 338. The 

 Use of Manures. 339. In Conclusion. 



