8 DEPARTMENT OF AGRICULTURE BULS. 701-125. 



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



States — Continued. Page. 



Farm equipment 35 



Beet by-products and live stock 40 



Labor problems 41 



The successful grower 43 



Diseases 44 



Insects 47 



Bv-products 48 



Roads • 49 



Contracts 50 



Area competition 53 



Sugar-beet seed 54 



Other publications of the United States Department of Agriculture relat- 

 ing to sugar and beet-sugar production 55 



Department Bulletin No. 722. — A Study or Heart-rot in Western 

 Hemlock: 



Introduction 1 



Present status of Western Hemlock in the trades 2 



Echinidontium tinctorium 3 



The diseases caused by Echinodontium tinctorium 6 



Areas studied and field methods used 11 



Methods used in presenting data 14 



Infection age 16 



Relation of decay to site and to age 18 



Relation of decay to vigor, crown rating, size and volume 22 



Relation of decay to injury and to sporophores 24 



Theor}- of infection 30 



Discussion of results 31 



Methods of control 34 



Summary 36 



The President to the farmers of America 38 



Department Bulletin No. 723.^ — ^The Pink Bollworm with Special Ref- 

 erence TO Steps Taken by the Department of Agriculture to Pre- 

 vent its Establishment in the United States: 



Historical 1 



Original home 2 



Present range 3 



Present distribution in Mexico 5 



Nature and amount of damage 5 



Description and life history 7 



Natural enemies 14 



Precautions taken to prevent the introduction of the pink bollworm into 



the United States 15 



Discovery in Mexico I 21 



Discovery in Texas 22 



Present work of the Department of Agriculture '. 25 



Literature cited 27 



Department Bulletin No. 724. — Drainage Methods and Foundations 

 for ("ounty Roads: 



Primary soils 1 



Drainage 3 



Design of surface drainage 11 



Gutters 18 



Drop inlets and catch basins 24 



Subdrainage 28 



Foundations 39 



Notes on specifications 76 



Depart.ment Bulletin No. 725. — A Preliminary Study of the Bleach- 

 ing of Oats with Sulphur Dioxid: 



Introduction 1 



Method of bleaching oats commercially 2 



( 'haracter of investigations 3 



Summary 8 



A'ppendix 9 



