8 DEPAKTMENT OF AGEICULTUEE BULS. 401-425. 



Depaktment Bulletin No. 423. — -Labor Requirements op Dairy Farms 



AS Influenced by Milking Machines — Continued. Page. 



Comparative cost of milking by hand and by machine 14 



Effect on cows 15 



Effect of age of cow on efficiency of milking machine 16 



Stage of lactation period 17 



Efficiency of milking combinations 17 



Department Bulletin No. 424. — The Cottonwood Borer: 



Introduction 1 



Description 1 



Life history and habits 3 



Natural enemies 5 



Methods of control ■. 5 



Summary 7 



Department Bulletin No. 425. — Farming on the Cut-over Lands of 

 Michigan, Wisconsin, and Minnesota: 



Summary 1 



Description of the area 3 



Type of farming 4 



Crops 6 



Live stock 7 



Relation between income and tillable area 9 



Size of farm 10 



Unimproved land 11 



Land clearing 13 



Family income , 14 



Labor income 14 



Cropping systems and rotations 18 



Efficiency and distribution of labor 21 



Home and farm supplies 21 



Community breeders' associations 22 



Selecting a farm 22 



General suggestions '. 23 



