INDEX 



437 



relation to disease, 427 

 Motion of animals, 280 

 Mountains, 162 

 Mouth, digestion in, 322 



of animals, 276 



of man, 310, 312 

 Mucous membrane, 312, 316, 



318, 348 



Mucus, 312 ; 316, 322 

 Muscles, ciliary, 404 



in walls of arteries, 368 



protection of, 359 

 Muscular system, 378ff. 



Xails, 363 

 Narcotics, 328ff. 

 Natural science, 1 

 Nerves, auditory, 408 



cranial, 387 



motor, 385 



of animals, 281 



olfactory, 399 



sensoiy, 385 



supply of in muscles, 379 

 Nervous system, 383ff. 

 Nervousness due to eyes, 405 

 Neurons, 384 

 Neutral substances, 107 

 Neutralization, 107 

 Nicotine, 328 

 Night, 151 

 Nitric acid, 106, 108 

 Nitrogen, in air, 101, 102, 103, 



121, 122 



Nose cavity, 348 

 Nostrils, 347 

 Nucleus, 196 

 Nutrition, 207 



Oceans, 160 

 Oils, 302, 323 

 test for, 302 



Olfactory nerves, 399 

 Opium, 329 



Orbit of earth, 152, 153 

 Organs, coordination of, 383 



definition of, 275 



in body cavity, 311 

 Oxidation, 345~ 380 



definition of, 93, 94 

 Oxides, 58, 66, 82, 85, 92, 93, 



94, 102, 106, 168 

 Oxygen, 90ff. 



attack on rocks, 168 



given off by plants, 204 



in air, 68, 90, 95, 121, 122, 

 351 



uses of, 94, 121, 122 

 Ovary, 234 

 Ovule. 234 

 Oysters, 267 



Palate, hard and soft, 312 

 Pancreas, 311, 319, 369 



juice from. 324 

 Papillae, 397. 398 

 Parasites, 243 

 Paramoecium, 274 

 Pasteurization, 308 

 Peat, 64 

 Pepsin, 323 

 Periosteum, 374 

 Peritoneum, 319 

 Perspiration, 360 

 Petal, 233, 234 

 Petiole, 200 

 Phalanges, 373 

 Pharynx, 317 

 Phosphorus, 72ff. 

 Physical changes, 51 



geography, 2, 120ff. 



properties, 53 



