500 



Index 



New Zealand, inhabitants, 120-1, 

 133, 135, 139 



Night hawk, color, 33G 

 ill. 335 



Nilssou-Ehle, 263 



Nissl bodies, 318 



Nitrites, 298 



Nitrogen, fixation, alfalfa, beans, 

 peas, 298; sources, 297-8 

 in water, 383 



Non-life, see Adaptation 



No])sca, 134 



North America, see Michaux, Sil- 

 va 



Nortli Dakota, see Devils Lake; 

 Public Health Laboratory 



Notochord, see Balanoglossus, 

 Tunicates, Amphioxus, Ver- 

 tebrates 



Nott, 450 



Nuclein, see Protoplasm 



Nucleus, algffi, 94-5, 189, 202-3 

 origin, 480 

 see Paramctcium 



Nutrition, see Human 



Nutrition Laboratory, see Carne- 

 gie Institution 



Nuttall, T., 34; ill. 35 

 G. H. v., 438 



f 



O 



Oats, see Inheritance 

 Ocean, depth, 351-2 



environment, 353 



floor, composition, 352-3 



life, 353 



light, 354 



pressure, 353-4 

 Oceanography, scope, 351 

 Octopus, destruction, 156, 358 



migration, 154 



ill. 356 

 Odcjr, see Water 

 CKnothera, .see Mutation 

 Onchorhynchus, see Salmon 

 Ooze, see Foraminifera, Pteroi)od, 



Radiolaria 

 Operations, see Antisepsis, Ca;sa- 



rean 

 Opossum, see Marsupial 

 Orange, hybridization, 268 

 Orbulina, invariability, 120 

 Orchestia, sex determination, 233 

 Ordovician period, life, 117-8, 120 

 Organ-forming substances, 189-91, 



202; ill. 190 

 Oragnic, see Dust 



Organism, see Adaptation 

 Organisms, destruction, see Pools, 

 temporary 



growth, 480 



marine, quantitative determina- 

 tion, 371 et seq. 



size, 480 

 Orientation, see Tropism 

 Origin, see Life 

 ' ' Origin of 82)ecies, ' ' 44, 45, 235, 



343 

 Ortliogenesis, 256; see Evolution 

 Osborn, 42-3, 54, 88, 134, 145; 



quoted, 235 

 Osmosis, 279-80, 295, 299 



influence on heliotropism, 316 



ill. 279 

 Osterhout, 318 



Ostracoderms, 117-8; ill. 118 

 Ostrich, distribution, 139 

 Ovary, see Reproduction 

 Ovists, 189 

 Owen, 39 

 Owens, see Lake 

 Owl, great -horned, food, 390 



barn, food, 390; ill. 389 

 Oxidation, see Life 

 Oxydizing ferment, 296 

 Oxygen, carriage by blood, 322 



content of water in summer, 382 



in winter, 379-80 



discovery, 283 



phos])horescenee, 355 



relation to aquatic animals, 380 

 Oysters, food, 353 



Pacific R. R. Surveys, 37-8, 44 

 Paget, 470 



Palaeozoic era, climate, 137 

 Panama, Canal, sanitation, 452, 

 453 



Isthmus, barrier, 254 

 Pancreas activator, 321 



in diabetes, 320 



ferment, 295, 299, 321 

 Pangenesis, 202 



Paramecium, 93, 327; life cycle, 

 200-1 



reactions, 305-6, 310-2 



reproduction, 96, 200 



structure, 305 



see Pure lines 

 Parasynapsis, 215 

 Parker, 312 



Parrakeet, distribution, 25, 180 

 Parrot, see Parrakeet 



