CONTENTS. 7 



Department Bulletin No. 40 — Continued. Page. 



Origin of the disease dependent upon specific infection 26 



Insects as carriers of the disease 27 



Winter survival of mosaic infection 28 



Occurrence of the disease under practical field conditions 29 



Methods of control 30 



Nature of the disease 31 



Summary 32 



Department Bulletin No. 41. — A Farm-management Survey op Three 

 Representative Areas in Indiana, Illinois, and Iowa. 



Introduction 1 



Method of work 2 



Location and description of the areas studied 3 



Definitions of terms used in this survey report 7 



Influence of climate on results 8 



Farm profits 9 



Distribution of farm receipts 15 



Distribution of farm expenses 16 



Relation of profits to the efficiency of the farmer 17 



Farm capital 18 



Relation of the size of the farm to the profits 24 



Relation of the size of the farm to the efficiency of operations 26 



Relation of the size of the farm to the crop yields 29 



Relation of the type of farming to the income 29 



Systems of farm tenure 34 



Comparison of crop yields on farms operated by owners with those operated 



by tenants 35 



Relation of the income to the age of the farmer 36 



Relation of the education of the farmer to his income 88 



Farming as a business 39 



Summary 41 



Department Bulletin No. 42. — The Action of Manganese in Soil. 



Review of earlier experiments with manganese in soil culture 2 



Manganese in aqueous extracts of soils 9 



Experiments with manganese in the field 19 



Acidity of the soil in the various plots 24 



Oxidative power of plots with and without manganese 25 



Catalytic power of plots with and without manganese 80 



Summary 31 



Department Bulletin No. 43. — American-grown Paprika Pepper. 



Historical introduction 1 



Legal definition of "paprika " 2 



Botanical origin of paprika 4 



Characteristics of American paprika 4 



Commercial considerations 11 



Cultural considerations 12 



Harvesting 17 



Curing 17 



Storage 19 



Yield 20 



Financial returns 21 



Outlook for the future 23 



