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 Map pins with numbers, 243, 247 presentations, 208 tacks, 225

Maps, coloring, 209 for corporation records, 293 for election returns, 341 for wall use, 225, 229 mounting of, 231 shading, 209

Marx, Guido H., 334

Mass curves, 149

Massachusetts Institute of Technology, 11, 198

Mazda lamps, 337

McAbee, William D., 245

McGraw-Hill Book Co., 335

Mechanical shading, 331, 332

Merchant tonnage of United States, 112, 113

Methods, general, 321

Metropolitan Sewage Commission, 20, 85

Milk-analysis curves, 114

Milk-production curves, 278, 279

Misleading figures, 326

Mode, 165, 170

Models, card-board, 336 solid, 336

"More than", basis for frequency curves, 179

Morgan, J. P. & Co., 15

Motion picture cameras for time study, 50

Motor, 346, 347

Motor trucks, cost for gasoline, 198 cost of operating, 11

Mount Holyoke College, 167, 176

Mounting maps, 231

Moving-average curves, 97, 283

Municipal parades, 343 record departments, 298

Muslin facing for pin boards, 231

Naphtaly, Sam. L., 122

Natural scale for curves, 132

Need for graphic methods, 1

Newark, N. J., public schools, 2

Newburgh, N. Y., report on schools, 24

New York Edison Company, 108, 138, 140, 146

New York municipal parade, 343

New York Public Library, 299, 329

New York Times Annalist, 13, 45, 313, 350

New York Times, 120, 121, 222, 351

Newspaper circulation curves, 92

Nippon Automobile Club, 346

Numbered map pins, 243, 247

Optical illusions, 80, 81, 358, 359

Order of Railroad Conductors, 103

Orders, routing, 19

Organization charts, 14, 15

Orrok, George A., 201

Panics, financial, 104

Parades, charts shown in, 342, 343 municipal, 343

Paraffin crayons, 57

Paris, height of buildings in, 220

Paris, plaster of, 336

Passengers carried on railways, 39

Passenger service on Union Pacific, 312

Payroll curves, 260 record curves, 276

Peaked-top curves plotting, 256

Peaks of curves, 99

Pearson, Karl, 202

Peddle, John B., 335

Pencil lines, erasing, 361

Pennsylvania Farmer, 124, 127, 128

Pennsylvania Railroad, 308 profile of, 213

Percentage scales for curves, 132

Perspective routing charts, 19

Philadelphia Commercial Museum, 70, 74, 76, 112

Philadelphia Transit Commissioner, 245

Philip's Chamber of Commerce Atlas, 26, 27.

Philippines, comparative size of, 211

Photographing bead maps, 252 pin maps, 230, 234

Photographs, drawing upon, 209 progress, 49, 50 used with maps, 209

Photostat, the, 296, 330 use of, 329

Pin boards for cost analysis, 191, 192

Pin maps to scale, 246

Pins for map use, 225 for population density on maps, 221

Pipe, cast-iron, 110

Pittsburgh & Lake Erie Railroad, 81, 82

Plant, Thomas G. & Co., advertisement, 233

Plaster of Paris, 336

Plates, weight of steel, 333

Pneumonia, deaths from, at different ages, 172, 173

Polar co-ordinates for curves, 80

Political campaigns, charts in, 338

Popular Science Monthly, 164, 165

Population curves, 130 density maps, 221