Irish spade; 238

Johnson, B. P.; 17

Johnston, John; 46, 168, 256, 262, 328, 329

Johnstone; 28, 31, 120

Joints, how covered; 255
" spaces at; 134, 140

Junction of drains; 195, 196

Keythorpe system; 40

Klippart, J. H.; 16

Land Drainage Companies; 349

Larch tubes; 111

Lardner, Dr.; 270

Laying out drains; 213, 253

Laying tiles; 219, 252-258

Legal rights to water; 85, 86, 346

Legislation; 340

Levelling instruments; 229-235

Lincolnshire fens; 19, 310

Lines, use of; 233, 253

Lord Lincoln's Act; 347

Madden, Doctor; 276

Mains, position and size of; 190-194

Mangolds, obstruction by; 316, 317, 379

Mapes, Prof.; 16, 167

Massachusetts, laws; 347

Mechi, Sheriff; 260, 339

Methods of drainage; 99

Mice; 104, 116, 315

Mill dams; 340-344

Mill streams; 89, 333

Minors; 194

Moisture, sources of; 78

Moles; 104, 116

Mole drains; 107

Mole Plow; 108

Moon, influence of; 306

Morris, Edward; 60

Nash, Prof.; 199

Nene River; 337

New York Park; 47, 219

Nourse, B. F.; 285, 299, 367
" statement and plan of; 195, 367, 372

Obstruction of drains; 313-320
" by sand; 313, 321
" by frogs, &c.; 183, 315, 379
" per-oxide of iron; 317
" roots; 315, 316, 379
" filling at joints; 319

Open ditches; 99, 263
" objections to; 101, 102

Opening ditches; 252

Outfalls; 345

Outlets; 176-183, 219, 252, 257, 315, 378

Over-draining peats; 309, 366

Parkes, Josiah; 25, 38, 40, 128

Paul's ditcher; 250

Peat tiles; 113

Peats, over-draining of; 309, 366

Peep-holes; 187, 188, 321, 373

Per-oxide of iron; 317

Pettibone, J. S.; 329

Picks; 245

Pipes; 47, 122, 123, 144
" capacity of; 131-138, 159, 191, 193
" cost in England; 201, 204
" " United States; 202-205, 218
" position of; 190-194

Pipe layer; 244, 245

Plans of drains; 195, 372, 377
" importance of; 161

Plow, use of; 253, 379

Plow, Fowler's drain; 247, 248
" Shanghae; 109
Paul's ditcher; 250
Routt's; 251

Plug drains; 107

Pole drain; 113

Pratt's Ditch digger; 248, 249

Pressure of water; 131, 132, 331, 332, 356
" water of; 84

Process of draining; 252-258

Puddling; 198, 266, 323

Pulverization; 260, 282, 299

Rain; 48, 158, 159, 284

Rain-fall; 50, 158, 378

Rain-fall, tables of; 53-60, 70-73

Relief pipes; 184, 186

Rese