6 DEPARTMENT OF AGRICULTURE BULS. 1051-1075. 



Department Bulletin No. 1063. — Sweet-Potato Storage Studies: Page. 



Importance of the sweet-potato crop 1 



Preliminary studies 2 



Objects of the experiments 3 



Methods of procedure 3 



Comparison of the keeping qualities of sweet potatoes under careful and 



under commercial handling 5 



Comparison of house storage and bank storage of sweet potatoes 6 



Comparison of the keeping qualities of injured and uninjured sweet 



potatoes 7 



Comparison of the practices of sorting and not sorting stored sweet potatoes . . 9 



Comparison of the keeping qualities of various varieties of sweet potatoes . . 10 

 Comparison of the keeping qualities of sweet potatoes when at different 



temperatures 12 



Keeping qualities of sweet potatoes stored in bins and in crates 13 



Relation of the temperature in bins to the temperature of the surrounding 



air 15 



Comparison of the keeping qualities of four important commercial varieties 



of sweet potatoes stored under like conditions 17 



Summary 18 



Department Bulletin No. 1064. — Oleoresin Production — A Microscopic 

 Study op the Eppects 'Produced on the Woody Tissues op Southern 

 Pines by Different Methods of Turpentining: 



The naval stores industry 1 



Purpose of the investigation 2 



Oleoresin 3 



Structure < f wood of turpentine pines 4 



Methods of study 7 



Proce3S of turpentining 8 



Result? obtained by different methods 12 



Chipping in the lightwood 31 



Suggestions for future practice 33 



Suggestions for future research 38 



Summary 40 



Department Bulletin No. 1065. — The Test Weight of Grain — A Simple 

 Method of Determining the Accuracy op the Testing Apparatus: 



Test weight per bushel and apparatus for taking it 1 



Variations in making weight-per bushel determinations 5 



Special points to observe in making correct weight-per-bushel tests 8 



Method of determining accuracy of test kettle 8 



Method of determining accuracy and sensitiveness of beam 11 



Department Bulletin No. 1066.- — Circulios that Attack the Young 

 Fruits and Shoots op Walnut and Hickory: 



Introduction 1 



The butternut curculio 2 



Distribution 2 



Food plants 2 



Nature and extent of injury 3 



Life history 4 



Natural enemies 7 



The black- walnut curculio 7 



Distribution 8 



Food plants 8 



Nature and extent of injury 8 



Life history 9 



Natural enemies 11 



The hickory-nut curculio 11 



History and distribution 12 



Food plants 12 



Life history 12 



Natural enemies 13 



The hickory-shoot curculio 14 



Distribution 14 



Food plants 14 



Life history 14 



Natural enemies 15 



Methods of controlling nut-infesting curculios 16 



