Coal tar; 116 Concrete, asphaltic; 128 Concrete materials; 100 Concrete pipe; 39 Control of erosion; 61 Costs; 70 County administration; 15 Cross sections; 60, 65 Culverts; 56 Curing concrete; 103 Design, broken stone roads; 89 concrete roads; 99 earth roads; 42 Desirability of road bonds; 27 Development of traffic; 2 Drainage, necessity of; 29 Drainage of roads; 29 Earth roads, in arid regions; 72 humid regions; 65 value of; 73 Earth works; 92 Education, rural; 6 Effect of grades; 54 Elevating grader; 66 Elevating grader work; 68 End walls for culverts; 39 Energy loss on account of grades; 57 Entrances, farm; 37, 61 Expansion joints; 104 Farm entrance culverts; 37 Federal administration; 17 Fillers; 118 Finance, highway; 19 Fine aggregate; 101 Finishing surface of concrete; 122 Foundation, asphaltic concrete; 129 brick; 109 macadam; 93 mixed macadam; 126 penetration macadam; 123 Telford; 94 Gang maintenance; 131 Grader, Maney; 67 use of; 69 Gravel, ideal; 81 natural; 83 roads; 74 General taxation; 24 Good roads and commerce; 7 Green concrete bedding course; 111 Highway administration; 13 Highway finance; 19 maintenance; 130 Importance of design; 30 Ideal road gravel; 81 Inter-city traffic; 5 Inter-county and inter-state traffic; 5 Internal resistance; 50 Intersections; 46 Laying tile; 35 Length of culvert; 37 Liquid asphalt; 118 Local farm to market traffic; 4 Macadam; 89 Maintenance, concrete; 105 earth roads; 70 general; 131 gravel roads; 88 macadam; 96 of highways; 130 patrol; 131 Maney grader; 67 Marginal curb; 113 Measuring materials; 101 Metal pipe; 38 Mixing wearing surface; 127 Mixtures; 117 Natural asphalt; 117 gravel; 79 Necessity for planning; 42 drainage; 29 Patching; 122, 125 Patrol maintenance; 131 Pebbles, size of; 80 Petroleum asphalt; 117 Placing asphaltic concrete; 129 Placing broken stone; 94 Placing concrete; 102, 103 mixed macadam; 127 Plans for roads; 43 Preliminary investigation; 44 Preparation of earth foundation; 102 of road; 85 Private entrances; 61 Properties of stone; 90 Proportions for concrete roads; 101 Purpose of highways; 1 Reinforced concrete box culverts; 39 Reinforcing; 104 Repressed brick; 107 Road oils; 117 Road plans; 43 Rocks, kind of, for macadam; 91 Rolling, macadam; 95 Rolling resistance; 50 Run-off; 31 Rural education; 6 Rural social life; 7 Safety consideration; 58 Sand bedding course; 111 Sand clay and gravel road; 74 Sand mortar bedding course; 111 Seal coat; 127 Serial bonds; 27 Sinking fund bond; 25 Slip scraper; 67 Special assessments; 19 Specifications; 119 Spreading screenings; 95