4 DEPARTMENT OE AGRICULTURE BUL.S. 601-625. 



Department Bulletin No. 606. — Relative Resistance of Farm Hard- 

 woods to Injection with Creosote — Continued. Page. 



Apparatus 4 



Materials used 6 



Method of applying the creosote 7 



Factors of affecting penetration 9 



Effect of structure on penetrance 9 



Grouping of species 11 



Relation of grouping to commercial treatment 16 



Conclusions 17 



Appendix _ ...... 18 



Characteristics of the various species and results of treatment 18 



Bibliography 34 



Department Bulletin No. 607. — Tests of the Absorption and Pene- 

 tration of Coal Tar and Creosote in Longleaf Pine: 



Introduction 1 



Materials used 2 



Effect on penetration of differences in the preservative, especially the 



effect of free carbon 5 



Tests of the effect of varying time, pressure, and temperature 12 



Summary „ 21 



Appendix 23 



Department Bulletin No. 608. — Varieties of Cheese: Descriptions 

 and Analyses: 



Introduction 1 



Description of varieties of cheese 3 



Analyses of cheese 62 



Sources of analytical data 71 



Index to descriptions and analyses of cheese 77 



Department Bulletin No. 609. — The Sweet-potato Leaf-folder: 



Introduction 1 



History, distribution, and synonymy 2 



Description of stages 3 



Food plants 5 



Seasonal history and habits ". . 5 



Natural enemies 9 



The sweet-potato leaf-folder in Southern Texas 9 



Summary 11 



Literature cited 12 



Department Bulletin No. 610. — Fish Meal as a Feed for Swine: 



Introduction 1 



Use of fish meal in the United States 2 



Feeding experiments with pigs 3 



1. Comparison of fish meal and tankage as supplementary feeds 3 



2. Fish meal as a supplement to dried potato 5 



Carcass test 8 



Conclusion 9 



Department Bulletin No. 611. — Walnut Blight in the Eastern United 

 States: 



Importance of the disease 1 



History of walnut blight 2 



The disease in the Eastern States 4 



Time of infection 5 



Control of walnut blight 5 



Summary 6 



Department Bulletin No. 612. — The Digestibility of the Dasheen: 



Introduction 1 



Nature of the diet during the test period 2 



Subjects 3 



Relation between maturity and digestibility 3 



Details of the experiments 4 



Discussion of results 9 



Conclusions ; 10 



