Index 



617 



Nectar of plants, 492 ff. 



Neon, 546 



Nernst lamp, 168 



New York City water supply, 190 ff., 



226 

 Newton's law of inertia, 276 



motion, 350 ff. 

 Niagara Falls, electric plant, 243, 



247, 249 



estimated power of, 385 

 Nimbus clouds, 30 

 Nitrates, 75, 475, 572 ff., 585 

 Nitrifying bacteria, 75, 475, 572 ff., 585 

 Nitrogen, 74 ff., 144, 517 ff., 521, 546, 



572 ff. 



as plant food, 471 ff., 572 ff. 

 cycle, 572 



Nodules on legume roots, 471, 573 

 Norther, 31 



Odor of flowers, 491 ff., 495 



Oidium lactis, 553, 585 



Oil lamp, 158 



Ooze, 412, 414 



Open-hearth process, 443 ff., 451 



Osmosis, 461 ff., 474 



Ovary of flower, 484 ff., 494 



Overshot wheel, 238 



Oxidation, 80, 123 ff., 137 



Oxids, 81, 123 ff. 



Oxygen, 76 ff ., 123, 138 ff ., 314, 515, 546 



Panama canal, 357, 382 ff., 532 

 Pantagraph, 320 

 Paraffin, 129, 131, 139, 314 

 Parallelogram of forces, 360 ff . 

 Parasites, animal, 524 ff., 531, 557, 588, 



590 



plant, 532, 554, 557, 570, 574, 585 

 Pascal's principle, 229, 233 

 Pasteur's discoveries, 213, 528, 605, 608 

 Pathogenic bacteria, 217, 570 ff., 588 

 Peat, 129, 455 

 Pelton wheel, 238 ff., 248 

 Penicillium, 553 

 Petals, 483, 494 

 Petroleum, 129, 145, 314 

 Phagocytes, 527, 597, 601, 603 

 Phagocytic theory of immunity, 601, 



603 



Phenol, see Carbolic acid 

 Phosphorus, 61, 79, 443, 518, 521 



Photosynthesis, 517, 518, 521 

 Physical change, 60, 131, 139 

 Pig iron, 439 ff., 451 

 Pistil, 484 ff., 494 

 Pistillate flower, 487, 494 

 Planetary winds, 64, 102 

 Plant food, 459 ff., 464, 471 

 Plants, and climate, 2 



light, 466, 478, 479, 517 ff., 581 



soil, 454 ff. 



soil air, 469 ff., 472, 474 

 moisture, 457 ff., 474 

 temperature, 472 ff., $7 



storage of food, 520 

 Plasmodium, 524 

 Platinum, 166, 168 

 Pollen, 219, 484 ff. 

 Pollination, 483 ff., 494 



and variation, 493, 513 



control of, 496 ff. 

 Poliomyelitis, 533 

 Porcelain, 421, 427 

 Porphyritic rock, 408, 409. 

 Power, importance of, 233 



sources of, 233 ff., 246 

 Pratt truss, 283 

 Preservation of wood, 405 ff. 

 Preservatives, 582, 586 

 Pressure, of air, 11 ff., 24 ff., 43, 391 ff. 



water, 225 ff., 299, 309, 341 

 Priestley, 70, 77 

 Prism, analysis and synthesis of light 



by, 180 ff. 



Propagation of plants, 498, 499, 503 

 Proteins, 517 ff., 573 

 Protoplasm, 460, 518 

 Protozoa, 524, 531, 588, 590 

 Public health, 208 ff., 210, 212, 595 ff. 

 Puddling furnace, 449 ff . 

 Pump, centrifugal, 231 ff. 



force, 230 ff. 



lift or suction, 15 ff., 230 

 Pupa of mosquito, 540 

 Purification of water, domestic, 197, 

 219 



municipal, 218 ff. 

 Putrefaction, 213 ff., 570, 578 ff. 

 Pyrometer, 89 



Quartz, 408, 415, 424 ff. 

 Quicklime, 417, 426 

 Quinine, 529, 531 



