CONTENTS. 9 



Department Bulletin No. 873. — The Shrinkage of Market Hay — Con. p a ge. 



Methods of making hay to prevent unnecessary shrinkage 18 



Limitations of rules for measuring shrinkage 21 



Money loss caused by shrinkage 23 



What is hay? 28 



Summary 32 



Department Bulletin No. 874. — Farm Land Values in Iowa : 



Purpose, scope, and method of investigation 1 



Trend of land values in the country as a whole 3 



Increase in the average value per acre of Iowa farm land since 1850 4 



Range of prices paid for farm land 7 



Extent of activity in buying and selling farms, 1919 *. 8 



Persons engaged in buying and selling 9 



Division of increment between different classes 13 



Terms of sale 14 



Farm earnings and incomes of owners, tenants, and landlords, 1913, 



1915, 1918, 1919 20 



The farmer's power of accumulation as indicated by data on net 



worth 33 



Summary of causes and probable effects of the " boom " ■ 37 



Department Bulletin No. 875. — Cotton Boll Weevil Control by the 

 use of Poison : 



Principles governing poisoning operation 1 



Kind of poison to use 3 



How to apply poison 8 



Organization of poisoning operation 17 



Dusting machinery to use 18 



Features to be noted in purchasing cotton-dusting machinery 24 



Cost of poisoning 26 



Gains to be expected from poisoning 26 



Advisability of poisoning under present conditions 28 



Control of the cotton leafworm and fall army worm with calcium 



arsenate 29 



List of publications relating to insects affecting cotton plant 30 



