INDEX 



301 



Pain, 247 



Paint, luminous, 155 

 Pancreatic juice, 255 

 Papillse, 276 

 Parallels, 181 

 Parasites, 231 

 Patent medicines, 294 

 Pendulum, compensated, 57 

 Pepsin, 254 

 Peptones, 254 

 Perennials, 221 

 Perspiration, function of, 277 

 Petals, 217 

 Phosphorescence, 155 

 Photosynthesis, 214 

 Physics, 2 

 Physiography, 2 

 Physiology, 2 

 Plane, inclined, 190 

 Planets, 8, 9 



orbits of, 9 



Plant and animal breeding, 229 

 Plasma, 259 

 Plumb bob, 176 

 Pole, negative, 206 



positive, 206 



star, 6, 8 



Poles of a battery, 206 

 Pollen grains, 216 

 Pollination, 217 

 Precipitates, 139 

 Preservatives, 234 

 Press, hydraulic, 190 

 Pressure cooker, 68 



uses of, 69 

 Primary colors, 160 

 Proteins, 214 

 Protoplasm, 211 

 Psychrometer, 108 



Ptomaines, 232 

 Ptyalin, 254 

 Pump, force, 124 

 lift, 123 



R 



Radiation, 84 



affected by color, 85 



effect of dust on, 87 



of gases on, 87 

 Rainbow, 161 

 Range of living things, 220 

 Reflection, angle of, 151 

 Reflectors of heat, 85 



of light, 150 

 Refrigeration, 68 



gases used in, 69 

 Reproduction, 216 

 Resonance, 169 

 Respiration, 215, 268 



and heat, 88 

 Reverberations, 169 

 Roentgen rays, 163 

 Round shoulders, 242 



Saliva, 254 

 Salt, acid, 146 



basic, 146 

 Salts, 146 



formation of, 146 

 Saprophytes, 231 

 Saturation point, 106 

 Science, applied, 2 



definition of, 1 



pure, 2 



special, 2 



Scientific names, 219 

 Seasons, 11, 184 

 Sensations, 284 



general, 284 



