CONTENTS. 7 



Department Bulletin No. 544. — The Red Spruce: its Growth and 



Management — Continued: Page. 



Soil and moisture requirements 14 



Light requirements 15 



Wind firmness 15 



Reproduction 16 



Form 22 



Length of life and maximum size 22 



Susceptibility to injury 23 



Growth 29 



Stands and yields 41 



Methods of cutting 45 



Brush disposal 59 



Sowing and planting 64 



Rotation 67 



Appendix 68 



Department Bulletin No. 545. — Important Range Plants: Their Life 

 History and Forage Value: 



Object of the study 1 



Character of the range and forage studied 2 



General morphology of grasses : 4 



Important species 4 



Summary 55 



Appendix: Plan of study 61 



Department Bulletin No. 546. — Effect of Fall Irrigation on Crop 

 Yields at Belle Fourche, S. Dak. : 



Introduction 1 



Rainfall 2 



Soil 3 



Methods used in the experiments 4 



Results of the experiments 5 



Crop yields 6 



Soil moisture 8 



Character of soil the determining factor 10 



Summary 12 



Department Bulletin No. 547. — Cooperative Purchasing and Market- 

 ing Organizations Among Farmers in the United States: 



Early history and growth of cooperative organization 1 



Present forms and tendencies 3 



Statistics of cooperation 11 



Cooperation in representative States 37 



Representative types of cooperative organizations 41 



Financing and business practices 50 



Agencies which assist cooperation 59 



Cooperative laws 61 



Cooperative law summations 62 



Digest of State cooperative laws 67 



The Clayton amendment to the United States antitrust laws 77 



Selected list of publications on cooperative purchasing and marketing 78 



Department Bulletin No. 548. — The Business of Ten Dairy Farms in 

 the bluegrass region of kentucky: 



General description of the region from the point of view of dairying 1 



Receipts from dairy products, together with labor incomes, on each of 10 



farms 2 



Other sources of income 3 



Cost of feed 4 



To what extent dairying may be developed in the bluegrass region 4 



Seven successful dairy farms analyzed and compared 6 



The farms that failed 10 



Comparison of the 7 more successful dairy farms with the average of 10 11 



Department Bulletin No. 549. — Crossties Purchased and Treated in 

 1915: 



Crossties purchased, 1915 1 



Preservation 6 



