IV DEPARTMENT OF AGRICULTURE BULS. 276-300. 



Department Bulletin No. 279 — Continued. Page 



Numbers of locks in the bolls 12 



Size of bolls 13 



Forms of rows 13 



Yields from sections A and B 14 



Quality and quantity of fiber 18 



Results in time-of-thinning test 18 



Results in distance-between-row test 19 



Summary , 19 



Department Bulletin No. 280. — Food Habits op the Thrushes op the 

 United States: 



Introduction 1 



Townsend's solitaire 3 



Wood thrush 5 



Veery and willow thrush 9 



Gray-cheeked and Bicknell's thrushes 11 



Olive-backed and russet-backed thrushes 13 



Hermit thrushes 18 



Department Bulletin No. 281. — Correlating Agriculture with the 

 Public School Subjects ln the Northern States: 



Introduction 1 



The plan 2 



How the teacher may organize a club 2 



Prizes 4 



How to keep up the club interest 5 



School-exhibit day 5 



September 6 



October 9 



November 12 



December 14 



January 16 



February 18 



March 20 



April 22 



May and June 24 



Correlation supplements , m 25 



Department Bulletin No. 282. — A Study of the Soft Resins in Sul- 

 phured and Unsulphured Hops ln Cold and in Open Storage: 



Introduction 1 



Preparation of the hops studied 2 



Changes in physical appearance 3 



Moisture content and changes in the proportion of soft and hard resins 4 



Hard resins 4 



Changes in the composition of the soft resins 10 



Chemical values of the soft resins 15 



Summary 18 



Department Bulletin No. 283. — The Production of Sulphuric Acid and a 

 Proposed New Method of Manufacture: 



Introduction 1 



Methods of manufacture , . . 2 



Measurement of a plant's efficiency 5 



New modification of chamber process 9 



Factory considerations 13 



Appendix 15 



Department Bulletin No. 284. — Construction and Maintenance of 

 Roads and Bridges: 



Introduction 1 



Work of the Division of Construction — 



Object-lesson roads 2 



Superintendence of county roads 23 



Work oi the Division of National Parks and Forest Roads — 



Work done in national forests 54 



Work done in national parks • 57 



Work of the Division of Maintenance 58 



