DEPARTMENT OF AGRICULTURE BULS. 901-925. 



Department Bulletin No. 905. — Principles of Live Stock Breeding: 



Evolution of animal breeding .' 



Reproduction 



The reproduction cells in relation to heredity 



Details of heredity transmission 



The determination of sex 



Mendelian heredity in live stock 



Heredity of form and function in live stock 



The system of breeding 



Methods of selection 



The value of purebreds 



Summary 



Department Bulletin No. 906. — The Use of Concrete Pipe in Irrigation: 



Introduction , 



The use of pipe in irrigation 



Incasing old pipes of metal and wood with concrete 



Concrete pipe 



Reinforced concrete pipe 



Manufacture of plain concrete pipe 



Quality of concrete pipe 



Cost of unreinforced pipe 



Laying concrete pipe 



Causes of failure in concrete pipe 



Pipe systems for irrigation 



Settling basins and screens 



Air vents 



Relief stands 



Measuring devices for pipe irrigation systems 



Distributing hydrants 



Department Bulletin No. 907. — Fumigation of Citrus Plants with Hydro- 

 cyanic Acid: Conditions Influencing Injury: 



Introduction 



The effect of hydrocyanic acid on plants 



Details of experiments „ 



The effect on plant injury of temperature, light, and moisture before fumi- 

 gation 



The effect on plant injury of temperature, light, and moisture after fumi- 

 gation 



The effect on plant injury of temperature, light, and moisture during fumi- 

 gation 



General discussion of factors which influence fumigation injury 



The concentration of the gas 



The length of exposure 



The physiological condition of the plant 



Atmospheric and light conditions 



Summary 



Literature cited 



Department Bulletin No. 908.— The Maine Sardine Industry. 

 Introduction: 



The sardine 



The Maine sardine industry 



The Maine sardine 



Food value of the canned sardine 



Purpose of investigation 



Methods employed in packing sardines 



Experimental work: 



Methods of analysis 



Composition of the sea herrinj. , . 



Food of the sea herring 



Swells 



Transportation of the fish ... 



Pickling and salting the fish 



Flaking the fish 



Drying the fish 



Packing the fish 



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