544 



NATURE-STUDY 



Oak, 331, 493. 



Observation, 8, 47. 



Onion bulb, 310, 321. 



Orb spider, 248. 



Orchard, 460; enemies, 217; birds. 



Chap. XX. 

 Oriole, 104, 106, ill, 113, 120, 122, 



124, 221. 

 Orthopiera, i8g. 

 Oscillatoria, 339. 

 Ostrich, 103, 136. 



Owl, loi, III, 112, 119, 124, 126, 128. 

 Oxygen, 500; from plants, 319. 

 • Oysters, 255. 



Painted beauty butterfly, 237. 



Parachute fruits and seeds, 336, 447. 



Parasites, insects, 224, 227; fungi, 

 392- 



Peacock, 106. 



Penguin, 103. 



Perch, 173. 



Perennials, 281, 296. 



Pets, 72, 404. 



Phoebe, iii, 112, 122. 



Photography, 500. 



Photosynthesis, 316. 



Physiography lessons, 499, see Earth- 

 study. 



Physiology, human. Chap. XX. 



Physics lessons, Chap. XX. 



Pickerel, 173. 



Pictures, 36. 



Pigeons, 135. 



Pill-bug, 251. 



Pine, seeds, 349; lumber, 373, 433. 



Pitcher-plant, 320. 



Plant-lice, 217. 



Plants, physiology. Chap. XVII, 

 450, 479, 496; movements, 338, 

 496; useful, 353, 356, 420, 433, 

 490; poisonous, 492; aquatic, 

 491; improvement, 505; intro- 

 duction, 506; diseases, 493, 504; 

 graded lessons. Chap. XX. 



Plantain, 315. 



Planting, 271; trees, 378. 



Pleasures in nature, 14. 



Plover, 118. 



Plumage, 102. 



Poetry of nature, 17, 65. 



Poisonous plants, 492. 



Pollination, 209, 224, 324, 326, 329, 

 459, 465, 481, Chap. XX. 



Polygonum, 349. 



Potato, 310, 431, 433. 



Potting, 283. 



Poultry, 145, 447, 464. 



Prairie chicken, 120, 122. 



Prairies, 366. 



Preparation of teachers, 25, 34, 41, 49. 



Presentation methods, 21, 23, 24. 



Promethea moth, 241. 



Propolis, 209. 



Protection of birds, 132, 464; mam- 

 mals, 502; trees, 374. 



Protective coloration, birds, 96, 104; 

 frog, 155; toad, 157; insects, 243. 



Protective devices of insects, 241. 



Puff-balls, 395. 



Pumps, 469. 



Pussy-willow, 311, 333. 



Quail, 104, no, 119, 120, 122. 

 Questioning, 29. 



Rabbit, 407. 



Rattlesnake, 163. 



Reasoning in nature-study, 11, 66. 



Red admiral butterfly, 236. 



Reference books, see Appendix. 



Reptiles, 148, 160. 



Respiration, 471. 



Robin, 103, 106, 107, III, 112, 116, 



117, 118, 120, 122, 124. 

 Rock formation, 453. 

 Rodents, 78, 415, 439. 

 Root, 303, 339. 

 Root-stalk, 309. 

 Rose-breasted grosbeak, 82, n6, 



122. 

 Runners, 308. 



Russian "thistle," 346, 351. 

 Rusts, 493. 



Sage, 225. 

 Salamander, 159. 

 Salmon, 173. 

 Sap, rise of, 304, 479. 

 Sapsucker, 125. 



