6 DEPARTMEIS^T OF AGRICULTURE BULS. 426-450. 



Department Bulletin No. 438. — The Pear Leaf-worm. Page.. 



Introduction 1 



History and distribution 1 



Possible origin 2 



Character and extent of injury 3 



Description and liabits 4 



Biology 9 



Natural control 17 



Remedial measures 18 



Summary , 22 



Department Bulletin No. 439. — The Soy Bean, with Special Reference 

 to its Utilization for Oil, Cake, and Other Products. 



Soy beans in Manchuria 2 



Soy beans' in Japan__l 4 



Soy beans in Europe 6 



Soy beans in the United States 7 



Methods of oil extraction 9 



Soy-bean meal as human food 11 



Soy-bean meal as stock feed * 13 



Soy-bean meal as a fertilizer 14 



Uses of soy-bean oil 15 



Analyses of important varieties of soy beans 16 



Possibility of developing a manufacturing industry with American- 

 grown soy beans . ^ 17 



Department Bulletin No. 440. — Lumbering in the Sugar and Yellow 

 Pine Region of California. * 



Part I. Introduction ._ 1 



The region 1 



The forest — 2 



Types of operations 4 



Labor : 5 



Camps 8 



Factors affecting the cut 10 



Part IL Logging 13 



Preparing logs for transport 13 



From stump to yard 18 



From yard to landing 34 



From landing to mill 41 



Woods supervision 64 



Part III. Manufacture. 65 



Mill pond 65 



Sawmills 67 



Sawmill lumber yards 80 



Transportation to common carriers 86 



Part IV. General cost factors 92 



Overhead charges 92 



Depreciation , , 95 



Summary of the costs of typical operations 96 



Department Bulletin No. 441. — The Action of Manganese Under Acid 

 and Neutral Soil Conditions. 



Effect of manganese on Arlington soil under acid conditions 2 



Oxidative power of plats with and without manganese under acid 



conditions 5 



Effect of manganese on Arlington soil under neutral conditions 6 



Oxidative power of plats with and without manganese under neutral 



conditions 9 



Summary : ^ lil 



