11, 198 Mazda lamps, 337 McAbee, WiUiam D., 245 McGraw-Hill Book Co., 335 Mechanical shading, 331, 332 Merchant tonnage of United States, 112,

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,

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,

New York municipal parade, 343 New York Public Library, 299, 329 Neiv 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 ■ :