4 DEPARTMENT OP AGRICULTURE BULS. 126-150. 



Department Bulletin No. 132 — Continued. Page. 



Prizes 4 



How to keep up the club interest 4 



The scheme for grades one to five 5 



The scheme for grades six to eight 15 



Correlation supplements 27 



Suggested problems in arithmetic 38 



Department Bulletin No. 133. — Experiments with Crops under Fall Irri- 

 gation AT THE SCOTTSBLUFF RECLAMATION PROJECT EXPERIMENT FARM: 



Introduction 1 



Soil conditions 2 



Rainfall 2 



Methods of experiment ". . . . 3 



Results of experiments 5 



Soil-moisture studies 15 



Summary 16 



Department Bulletin No. 134. — Citrus Fruit Insects in Mediterranean 

 Countries: 



The Mediterranean fruit-fly 1 



Other insects in oranges and lemons likely to be mistaken for the Mediter- 

 ranean fruit-fly 11 



The black scale 12 



Chrysomphalus dictyospermi 15 



The purple scale 17 



The long scale 18 



Parlatoria zizyphus 18 



The oleander scale 19 



The cottony cushion scale 20 



The citrus mealy bug 21 



Prays citri 22 



Red spiders 23 



Thrips 23 



The control of citrus-fruit insects in Mediterranean countries 23 



Mediterranean citrus-fruit insects that do not occur in the United States 



and the possibility of their introduction 26 



The olive fly 27 



The Mediterranean citrus-fruit industry « . . . 28 



Meteorological data for Valencia, Spain, and Palermo, Italy 34 



Department Bulletin No. 135.— Experiments in the Production of Crops 

 on Alkali Land on the Huntley Reclamation Project, Montana: 



Introduction 1 



Quantity and character of the salt. 4 



Ground water 5 



Behavior of crops on newly cultivated soil 6 



Results of experiments 7 



Summary 17 



Practical suggestions 18 



Department Bulletin No. 136. — Highway Bonds: 



Introduction.. 3 



County highways 5 



Economic value of the market road 6 



Cost of highway construction 10 



Cost of highway maintenance 12 



The bond issue 14 



Total cost of highways 24 



Expediency of issuing highway bonds 27 



Appendix A: State highway bonds 34 



Appendix B : Approximate lists of county and other bonds 37 



Appendix C: Cost elements of gravel, macadam, and bituminous roads — 86 



Appendix D : Theory of interest applied to highway-bond calculations, etc . 91 



Department Bulletin No. 137. — Some Distinctions in our Cultivated 

 Barleys with Reference to their Use in Plant Breeding: 



Introduction 1 



Review of the literature 3 



The rate of development , 5 



