4 DEPARTMENT OF AGRICULTURE BULS. 526-650. 



Department Bulletin No. 528. — Seasonal Distribution of Farm Labor 

 in Chester County, Pa. — Continued: 



Part II. — How to use the foregoing data — Page. 



Description of f ami selected 20 



Determining labor requirements of old system 22 



Replanning cropping system 25 



Comparative labor requirements 28 



Comparative returns 28 



Conclusion 29 



Department Bulletin No. 529.— Validity op the Survey Method of 

 Research: 



Introduction 2 



How farm records are obtained 7 



Accuracy of the farmer's knowledge 8 



Accuracy of cost-accounting methods 9 



Law of error 1 



Mistaken notions of accuracy 13 



Department Bulletin No. 530. — The Organization and Management of 

 a Farmers' Mutual Fire Insurance Co.: 



Introduction 1 



Purpose of the company 2 



Business territory 3 



Membership and voting privilege 3 



Board of directors 5 



Officers and committees 6 



Applications for insurance 8 



Inspection of risks 10 



Form and term of policy 10 



Limiting the size of individual risks 11 



Evils of blanket insurance 12 



Liability of the company and of the insured 13 



Reduction and cancellation of insurance 14 



Fees and assessments 15 



Classification of risks 16 



Settlement of losses 18 



Reserve 18 



Amendment of by-laws and articles of incorporation 19 



Suggestive organization and business forms 17 



Department Bulletin No. 531.— Rhizopus Rot of Strawberries in Transit: 



Introduction 1 



Causes of decay in transit 2 



Physiology of Rhizopus nigricans 7 



Present shipping practices 11 



Sources of infection by Rhizopus nigricans 13 



Summary 19 



Literature cited 21 



Department Bulletin No. 532. — The Expansion and Contraction of Con- 

 crete and Concrete Roads: 



Laboratory measurements of expansion and contraction 2 



Results of expansion and contraction measurements 5 



Measuring the contraction and expansion of concrete roads 12 



Results of test measurements at Chevy Chase, Md 15 



Expansion and contraction of Ohio Post Road 20 



General discussion of the expansion and contraction of concrete pavements. 27 



Conclusions 30 



Department Bulletin No. 533.' — Extension of Cotton Production in 

 California: 



Introduction 1 



Increasing demands for long-staple cotton 2 



New types of cotton available 3 



Cotton formerly grown in California 4 



Extent of possible cotton territory in California 6 



Natural conditions favorable 7 



Returns that may be expected from cotton 8 



Labor requirements of cotton 9 



Cotton culture a community undertaking 11 



