CONTENTS. 



Department Bulletin 1904. — The Flow of Water in Irrigation Chan- 

 nels — Continued. 



Appendix: Page. 



Concrete linings 62 



Wooden flumes 64 



Metal flumes with smooth interior 64 



Metal flumes with projecting interior bands 64 



Metal flumes with corrugated iron 65 



Masonry-lined sections 65 



Earth channels 65 



Cobble-bottom ditches 68 



Department Bulletin 195. — Potato Breeding and Selection: 



Introduction 1 



Potato breeding and selection defined 2 



Limitations of breeding and selection 2 



Early attempts at potato breeding 3 



Technique of potato breeding 6 



Pollen-producing varieties 9 



Results of experimental crossing 11 



Reciprocal crosses 15 



Varietal affinity 16 



Potato crosses made in 1910 ., 17 



Method of growing and testing seedlings 18 



Seedling inheritance in the Fj generation 20 



Potato improvement by selection 21 



Early selection experiments 22 



Selection methods 27 



Departmental investigations 29 



Summarj' 35 



Departmental Bulletin 196. — Methods Followed in the Commercial 

 Canning of Foods: 



Modem factory equipment and methods 1 



Containers 10 



The label 12 



Use of the term "canned" 13 



Spoilage 13 



Effect of heat and cold 14 



Cost of canned foods compared with fresh 15 



Extent of the canning industry in the United States 16 



Packing seasons 16 



Experimental work 19 



Detailed consideration of the various products 21 



Depart.\ient Bulletin 197. — Homemade Lime-sulphur Concentrate: 



Experiments at Berryville, Va ., 1 



Experiments at Winchester, Va 2 



Experiments at Ilagerstown, Md 3 



lOxperirnents at Vienna, Va 4 



Experiments at Benton Harbor, Mich 4 



Directions for preparation of lime-sulphur concentrate 5 



I'ri'paration of highly concentrated lime-sulphur solution 6 



Relative cost 6 



Department Bulletin 198. — Report Upon the Cypress Creek Drainage 

 Distuict, Dehiia and Chicot Counties, Ark.: 



Introduction 1 



General d em^,ription 2 



Pre.^-nt drainage conditions 4 



The survey 6 



The drainage problem 6 



Run-off 7 



Drainage plans foiiHidered 10 



The recommended plan 13 



Maintenance 19 



A comprehenflive drainage syeftem needed 20 



