rvoirs; 341, 343

Ridge and furrow; 195

Rolling pipes; 205, 380

Roots, length of; 258, 259, 283
" obstruction by; 315, 316, 379

Round pipes; 47, 122

Rumford, Count; 272, 273, 287

Ruffin, Edmund, Esq.; 29, 364

Rye and Derwent; 344

Saturation; 66

Scoops; 244

Screens at outlets; 183

Season lengthened; 261

Shallow drains; 168

Shanghae plow; 109

Shedd and Edson; 21, 51, 372

Shoulder drain; 110

Shovels; 236, 237

Silt basin; 186, 379

Sinkholes; 198

Size of tiles; 190, 201, 377

Smith, of Deanston; 26, 37

Snow, fall of; 59

Sole-tile; 125

Spades; 235, 236, 240-242

Spirit level; 230

Springs; 78-83
" drainage of; 34
" run before rain; 270-271
" how to preserve; 189

Staff and target; 231

Stagnant water; 93

Stone drains; 114-119, 377
" cost of; 114, 222

Stones above tiles; 118

Streams affected by drainage; 333-340

Subsoil plow; 169

Subsoiler, Marcus and Co.'s; 107

Surface washing prevented; 261

Swallow-holes; 197, 198

Swamps; 91, 360
" drainage of; 360-363

Swamp-lands; 17

Swan, R. J.; 168

System, importance of; 160, 173

Tables of evaporation; 72, 73
" excavation; 216
" filtration; 70, 71
" rain-fall; 53-59, 71-73
" of tiles to acre; 220
" number of rods; 220
" capacity of pipes; 135-138

Talpa; 23

Temperature; 67, 189, 280, 287-300
" underground; 187, 288, 291
" for vegetation; 271

Thermometer, wet and dry; 64, 65

Thomas, J. J.; 229

Tile-drainage; 120

Tiles, cost in England; 201, 212
" " United States; 201-205
" forms of; 122-130
" length of; 221
" size of; 130-138
" weight of; 219
" number to the acre; 220

Tile machines; 46, 202-210

Tile-works; 47, 121

Tools; 225-246

Tops and bottoms; 140, 319, 379

Traps; 185, 186, 379, 380

Velocity of water; 131

Vermin; 104

Virginia; 18, 364

Warder, Doctor; 346

Water, how it enters; 138, 314, 320
" stagnant; 93
" of drainage, uses of; 189, 339
" velocity of; 131

Water passage; 129

Water-line; 51, 139

Water-powers; 333, 335, 341-345

Water of pressure; 84, 161

Water, pressure of; 84, 140, 141
" rights in; 85, 86

Wedge drain; 110, 236

Weight of tiles; 219, 381

Wells, drainage into; 197-199
" dried by drains; 85, 366

Well and relief-pipe; 184-186