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 high