CONTENTS. 7 



Department Bulletin No. 316. — Home Projects in Secondary Courses 



in Agriculture: Page. 



Introduction 1 



Development of the home-project idea 2 



Essentials of a successful project 4 



Some project outlines 8 



Some project problems 18 



Department Bulletin No. 347. — Methods for the Determination of 

 the Physical Properties op Road-building Rock: 



Introduction 1 



Physical properties of road-building rock 2 



Physical tests of road materials 3 



Appendix A— Selection and shipment of samples 22 



Appendix B— Equipment of laboratory 26 



Publications of the U. S. Department of Agriculture relating to roads and 



road-building materials 28 



Department Bulletin No. 348. — Relation op Mineral Composition and 

 Rock Structure to the Physical Properties op Road Materials: 



Introduction 1 



Examination and classification of rocks for road making 2 



Mineral composition of rocks for road making 4 



Physical pro; >erties of road materials 10 



General relation between the physical properties of rocks and their mineral 



composition and structure 11 



Effect of secondary minerals on the physical properties of rocks for road 



building 13 



Summary and conclusion 24 



Department Bulletin No. 349. — The Raisin Industry: 



Origin and growth of the industry 1 



Some fluctuations in the industry 3 



Raisin- vineyard soil 5 



Pre] laration of soils •. 5 



Pruning methods in raisin vineyards 6 



Raisin varieties 8 



Climatic conditions in the raisin belt 11 



Harvesting and preparing the crop 11 



Dipping and scalding raisins 12 



Packing raisins 13 



(lapses of raisins 13 



Seeded raisins 14 



Department Bulletin No. 350. — The Utilization op Cherry By- 

 products: 



Introduction 1 



Relation of the cherry to sweet and bitter almonds and allied plants 2 



Commercial importance of cherries t 2 



Accumulation and disposal of by-products 3 



Commercial products obtainable from cherry pits 4 



Commercial products obtainable from cherry juice 22 



Summary 24 



