﻿CONTENTS. 5 



Department Bulletin No. 17. — The Refrigeration op Dressed Poultry 



in Transit. Page. 



Historical sketch 1 



Purpose of the investigation 3 



Scope of the investigation 4 



Shipment of poultry 5 



Refrigerator cars 13 



Temperature in car 24 



Temperature of packages in car 27 



Conclusions '30 



Department Bulletin No. 18. — A Report on the Phosphate Fields op 

 South Carolina. 



Introduction 1 



History 1 



Geography and topography 2 



Classes of phosphate 3 



Geological occurrence and origin 4 



Physical and chemical properties 5 



Methods of mining 6 



Washing the rock 7 



Cost of production 8 



Waste material 9 



Disposal of product 9 



Extent of operations 10 



Present condition of the industry 10 



Future of the industry 10 



Summary 11 



Department Bulletin No. 19.— The Grape Leaphopper in the Lake Erie 

 Valley. 



Introduction 1 



History 2 



Origin and distribution 3 



Food plants 3 



Character of injury and destructiveness 5 



Occurrence and destructive outbreaks 6 



Allied species 9 



Description 12 



Seasonal history 16 



Parasites and predaceous enemies 32 



Natural checks 34 



Remedies 34 



Conclusions 42 



Bibliography , 43 



Department Bulletin No. 20. — The Management op Sheep on the Farm. 



Introduction 1 



The value of sheep on the farm . 2 



Establishing a flock 3 



Size of the flock 10 



Care of the flock 11 



Feeding sheep 35 



Shearing and care of the wool 47 



Cost of maintenance 49 



Consumption of mutton on the farm 50 



