CONTENTS. 5 



Department Bulletin No. 309. — Zacaton as a Paper-making Material — 



Continued. Page. 



Conclusion 27 



Publications of the United States Department of Agriculture relating to 



materials for paper making 28 



Department Bulletin No. 310. — Digestibility op Some Animal Fats: 



Introduction 1 



Nature of the diet. 2 



Experimental methods 4 



Digestion experiments 5 



General discussion 20 



Publications of the United Statea Department of Agriculture relating to 



food and nutrition 23 



Department Bulletin No. 311. — The Handling and Marketing op the 

 Arizona -Egyptian Cotton of the Salt River Valley: 



Introduction 1 



Necessity for clean picking 2 



Storage of seed cotton 3 



Ginning the Arizona-Egyptian cotton 3 



Sampling cotton at the gin stands 4 



Baling and covering the cotton 5 



Advisability of gin compression 5 



Tagging, marking, branding, and weighing the cotton 6 



Storage of ginned Egyptian cotton 7 



Classing the Arizona-Egyptian cotton 7 



Staples 9 



Advantages of grading cotton 10 



Marketing of Arizona-Egyptian cotton 11 



Conclusions 15 



Department Bulletin No. 312. — Phosphate Rock and Methods Proposed 

 for its Utilization as a Fertilizer: 



Introduction 1 



Phosphate deposits of the United States 3 



Forms in which phosphoric acid is applied to soils 8 



Processes for treating phosphate rock in the manufacture of phosphoric 



acid and phosphatic fertilizers 8 



Processes for the production of phosphoric acid or soluble phosphates by 



combined heating and acid treatment 12 



Double decomposition by means of an alkali, an alkali salt, or alkaline 



earth 12 



Processes to be used in connection with the iron and steel industries 14 



Processes in which the phosphorus or phosphoric acid is volatilized 15 



Processes dealing with the production of two or more fertilizer elements. . . 17 

 Processes dealing with the production of available phosphates by elec- 

 trolysis 18 



Processes for the enrichment of phosphates 19 



Mechanical treatment of phosphates 20 



Miscellaneous processes for the production of available phosphates 20 



Appendix: Classified tabular list of patented processes 21 



Department Bulletin No. 313. — Features op the Sheep Industries op 

 Qnited States, New Zealand, and Australia Compared: 



Introduction 1 



General conditions in New Zealand's sheep husbandry 2 



Genera] conditions of sheep husbandry in Australia 4 



Tenure of pastoral lands G 



Flock management 8 



Breeds and types of sheep in Australia 9 



Breeds and l ypesin New Zealand 17 



Shearing and wool classing 21 



Expense of preparing wool for market 28 



Selling graded or classed wools in the United States 29 



Cooperative shearing sheds in New Zealand 31 



Ed neat ion of wool growers and their employees 31 



Sheep raisers' organizations 315 



Probable extent of future importations of mutton and wool from Australasia. 34 



