DEPARTMENT OF AGRICULTURE BULS. 376-400. 



Department Bulletin No. 379. — Dust Explosions and Fires in Grain 



Separators in the Pacific Northwest. Page, 



Introduction 1 



Plan of investigation 2 



Classification of explosions 3 



Results of field investigation 6 



Static electricity as a cause of explosions 9 



Experimental field and laboratory work 11 



Nature of dust explosions 17 



Methods developed for preventing explosions or extinguishing fires 19 



Special acknowledgments -. 22 



Department Bulletin No. 380. — Endotha Parasitica and Related Species. 



Taxonomy 1 



Morphology and development 22 



Physiology 36 



Summary 74 



Literature cited 77 



Department Bulletin No. 381. — Business Practice and Accounts for 

 Cooperative stores. 



Introduction 1 



Corporate records 3 



Minutes 3 



Subscription agreement 5 



Certificate book 7 



Stock certificate register 7 ' 



Dividend register 7 



Membership ledger 7 



Interest and dividend account 10 



Statements and reports 14 



Manager's report 15 



Inventory 15 



Auditor's report 16 



President's report 16 



Operating records 26 



Strictly cash business 26 



Both cash and credit business 41 



Auditing 50 



Audit of resources and liabilities 52 



Ofiice equipment 53 



Summary 55 



Bibliography 56 



Index of records and accounting forms 56 



Department Bulletin No. 382. — Cotton Boll-weevil Control in the 

 Mississippi Delta, with Special Reference to Square Picking and 

 Weevil Picking. 



Introduction 1 



Square picking 3 



Weevil picking 5 



General considerations 7 



Summary and conclusions 9 



Department Bulletin No. 383. — New Sorghum Varieties for the Central 

 AND Southern Great Plains. 



Introduction 1 



Description and adaptation of the new varieties of sorghum 2 



Comparison of the field records of the new sorghum varieties 8 



Value of the varieties in different portions of the Great Plains 10 



General conclusions 13 



