CONTEjSTTS. 7 



Department Bulletin No. 717. — Digestibility op Protein Supplied by 



Soy-bean and Peanut Press-cake Flours — Continued. Page. 



Preparation of soy-bean and peanut press-cake flours 12- 



The subjects of the digestion experiments 14 



Preparation of experimental diets 14 



Details of the experiment 15 



The digestibility of protein supplied by soy-bean press-cake flour 16 



The digestibility of protein supplied by peanut press-cake floiu* 19 



Expeiiments with flour made from roasted peanuts 20 



Experiments with flour made from raw peanuts 22 



Summary of all experiments with peanut flours 23 



General conclusions regarding the value of soy-bean and peanut flours as 



food _. 25 



Publications of the United States Department of Agriculture relative to 



food and nutrition 27 



Department Bulletin No. 718. — Small Sawmills: Their Equipment, 

 Construction, and Operation: 



Object of the bulletin 1 



General suggestions for portable sawmill owners 2 



The mill and milling 11 



Logging 38 



Appendix 57 



Water 57 



Steam 58 



Fuel 59 



Water wheels 59 



Engine friction brake 61 



Standard horsepower 61 



Gears. . . .■ 61 



Calculating the speed of saws, pulleys, and drums 62 



Saw gauge 62 



Mill-machinery terms 62 



Lumber terms 65 



Abbreviations 68 



Department Bulletin No. 719. — -Women's Rural Organizations and 

 Their Activities: 



Women's rural organizations are numersous and varied 1 



Organized effort of women develops home life 5 



Country women cooperate for broader agricultural opportunities 8 



Farm women's organizations promote community life in the country 10 



Department Bulletin No. 720.- — Food Habits of the Mallard Ducks 

 op the United States: 



Introduction 1 



Mallard 2 



Black duck 10 



Southern black duck 14 



Items of vegetable food identified in stomachs of mallard ducks 16 



Items of animal food identified in stomachs of mallard ducks 24 



Publications of United States Departmetit of Agriculture relating to the 



food habits of wild birds 36 



Department Bulletin No. 721. — The Beet-sugar Industry in the United 

 States: 



Beet-sugar mills in the United States 1 



Soil 6 



Subsoil 7 



Topography 8 



Climate 10 



Sugar-beet stand 13 



Water 18 



Drainage 21 



Seepage 23 



Fertility 25 



Crop rotation 29 



Competing crops 31 



