CONTENTS. 



Department Bulletin No. 917.— Farm Practice in Growing Field Crops 

 ' in the Sugar-beet Districts of Colorado — Continued. Page. 



Preparation of the seed bed 12 



Planting 19 



Manurial practice 2i 



Cultivation 24 



Irrigation 27 



Harvesting '. 33 



Marketing 40 



Cost of production 41 



Summary 52 



Department Bulletin No. 918. — Report on Investigations of the Pink 

 bollworm of cotton in mexico: 



The Laguna District 1 



Distribution of the pink bollworm 4 



Life history 5 



Seasonal history 19 



Feeding habits of larvae 21 



Damage caused by the pink bollworm 24 



Food plants 32 



Dispersal 35 



Natural control 38 



Repression 47 



Summary 56 



Literature cited 57 



Appendix 58 



Department Bulletin No. 919. — Unit Requirements for Producing 

 Milk in Western Washington: 



Character and scope of the work 1 



Methods uaed in obtaining the data 2 



Comparison of winter and summer results 3 



Description of herds 3 



Requirements for producing 100 pounds of milk 4 



Requirements for keeping a cow one year 6 



Credit for manure 7 



Credit for calves 9 



Requirements for keeping a bull 9 



Factors involved in production of milk 10 



Feed 10 



Pasture 11 



Labor 12 



Other costs 13 



Per cent comparison of factors involved in milk production 15 



Average compared with " bulk-line" costs 16 



Monthly distribution of factors in milk production 17 



Summary 19 



Department Bulletin No. 920. — Farm Profits: Figures from the 

 Same Farms for a Series of Years: 



Introduction 1 



Sources and character of data 3 



Summary 5 



The Ohio area 7 



The Indiana area 22 



The Wisconsin area 41 



Good management increases profits 55 



Department Bulletin No. 921. — Sugar-cane Juice Clarification for 

 Sirup Manufacture: 



Two methods in general use 1 



Disadvantages 2 



New method of clarification 2 



Vacuum evaporation in making eane sirup 12 



Use of vegetable decolorizing carbons in connection with infusorial earth 



clarification 14 



Infusorial earth clarification for sugar manufacture 14 



Summary 15 



