CONTENTS. 



Page. 



Department Bulletin No. 126. — Concrete Lining as Applied to Irriga- 

 tion Canals: 



Introduction 1 



Unlined canals 2 



Seepage losses 2 



Factors affecting seepage . 38 



The carrying capacities of concrete-lined canals 38 



Other kinds of lining 47 



The economy of concrete lining 48 



Suitable grades for lined canals 50 



Alignment of lined canals 51 



The effect of alkali on concrete lining 51 



The expansion and contraction of concrete 53 



Joints m concrete lining 57 



Construction methods and cost 61 



Care to be exercised in operation 85 



Acknowledgment. 86 



Department Bulletin No. 127. — The Mycogone Disease op Mushrooms 

 and its Control: 



Introduction 1 



Historical review of the mycogone disease 2 



Investigations of the mushroom disease in America 6 



Conclusions 20 



Department Bulletin No. 128. — Distribution and Migration op North 

 American Ralls and their Allies: 



Introduction 1 



North American rails and their allies 4 



Department Bulletin No. 129.- — Yields from the Destructive Distil- 

 lation of Certain Hardwoods: 



Purpose of experiments 1 



Method of investigation 1 



Computation of results 6 



Yields on percentage weight basis 7 



Yields per cord 9 



Department Bulletin No. 130. — Operating costs of a Well Established 

 New York Apple Orchard: 



Introduction 1 



Management of the farm 3 



History of the orchard 4 



Rates paid for labor 5 



Cash costs .• 12 



Fixed costs 14 



Summary 14 



Department Bulletin No. 131. — Repellents for Protecting Animals from 

 the Attacks of Flies: 



Introduction 1 



Injury caused domestic animals by biting flies 2 



The influence of color on flies 5 



Internal remedies for repelling flies 6 



External remedies for repelling flies 7 



Experimental tests of various substances and mixtures for repelling flies. . 12 



General summary 23 



Department Bulletin No. 132. — Correlating Agriculture with the 

 Public-School Subjects in the Southern States: 



Purpose of the bulletin 1 



The plan 2 



How the teacher may organize a club 2 



3 



