438 



INDEX 



Science, 1 



Physiology, definition of, 296 

 Pistil, 234 

 Pith, 227, 228 

 Plains, 163 

 Plant life dependent upon 



water, 115, 198, 211 

 Plants, air storage of, 216 



comparison with animals, 197 



composition of, 195ff. 



food, 198, 206 



importance of, 193, 205 242ff. 



leaves, 200ff. 



reproduction of, 232ff. 



respiration of, 215 



roots, 219ff. 



stems, 225ff. 



transpiration of, 208 



protection against loss of 

 water, 213 



waste products of, 216, 221 

 Plasma, 334, 335 

 Plateaus, 163 

 Pleura, 349 

 Pleurisy, 354 

 Pollen, 234 

 Pollination, 236 

 Pons varolli, 386, 387 

 Porifera, 269 

 Potassium chlorate, 92 

 Potassium hydroxide, 106 

 Pressure, atmospheric, 129 



column of mercury held by, 

 133 



effect of change on boiling 

 point, 42 



regions of high and low, 142 



variations in p. due to ele- 

 vation, 134 

 Priestley, Joseph, 92 

 Primates, 294 



Proteins, 206, 299, 323, 324 



test for, 300 



Protoplasm, 195, 196, 197, 272, 

 305 



composition of, 196 

 Protozoa, 270, 412 

 Ptomaines, 308 

 Pulse, 342 

 Pupa, 266 



Quarantine, 423 



Radius, 372, 373 

 Rain, 126 



amount of in U. S., 146 



distribution of, 172 



effect of winds on, 144 



work of r. in causing relief, 



169 



Rainbow, 143 

 Reflex action, 390 

 Refraction, 402 

 Rennin, 323 

 Reproduction, definition of, 282 



of animals, 281 



of plants, 232, 234, 235, 236, 



238 



Reptiles, 260 



Respiration, external and inter- 

 nal, 346 



of animals, 278 



of plants, 216 



organs of, 347 

 Respiratory system, 345ff. 

 Ribs, 372 

 Rickets, 376 

 Rind, 228 

 Rocks, 186, 189 



chemical effect on, 168 



effect of change of tempera- 

 ture on, 167 



