666 



Index 



poisons, 347, 395, 396, 409, 412, 445, 



451, 452, 457, 458, 460, 473 

 Polaris, 162-163, 198, (163) 

 polarity, 195-196, 636 

 poles, magnetic, 196, 199, 200, 215- 

 217, 223, 636 



of earth, 133, 134, 162, 200, 636 

 Pole Star, 162-163 

 pollen, 497, 504, 540, 636, (316) 

 pollution, 53-54, 59, 459, 636 

 pontoons, 285, (286) 

 porcelain, 302, 636 

 pork worms, 370 

 porous, 51, 53, 57, 636 

 portal circulation, 421, 636 

 portal vein, 404, 425, 636 

 positive electricity, 204, 206, 208 

 potassium, 29, 30, 307, 583, 636 

 potential, 205, 206, 208, 212, 636 

 potential energy, 17, 18, 50, 636 

 pottery, 302 

 power, 



definition, 75, 243, 636 



measurement of, 75, 212, 243 

 power plant, 18, 67, 68, 210, 224, 



225, (74, 224) 

 power stroke, 263, 264 

 precipitation, 121-122, 636 

 preparation of food, 369-376, 



(371) 

 preservation of foods, 61, 445-448, 



552, 597, (446) 

 pressure, 636 



electrical, 206 



of air, 37-40, 119, 131, 132-139, 

 282, 286, 581, (282) 



of steam, 88, 251, 260-261, 273 



of water, 49, 50, 52, 58, 68-71, 75, 

 276, (70, 71) 



of wind, 131, 132, 282 



prevailing westerlies, 134, 645, 



(133) 



Priestly, J., 577 

 primary colors, 182, 186, 187, 582, 



636 



prime meridian, 157, 159, 160 

 principle, 



defined, 7 



of moments, 244, 636 

 prism, 186 

 proboscis, 544, 636 

 progress, 5, 546-554, 580-611 



projects, 10, 21, 33, 44, 65, 78, 100, 

 117, 130, 147, 167, 179, 194, 202, 

 214, 227, 239, 254, 269, 289, 309, 

 318, 327, 338, 352, 368, 376, 381, 



391, 397, 408, 415, 429, 438, 450, 

 464, 477, 486, 503, 513, 526, 534, 

 545, 554, 610 



propeller, 272-273, 277, 281, 581, 606, 



636 



properties of matter, 14-15, 16, 636 

 protection against disease, 54-56, 



58-60, 347, 360, 417, 449, 460, 



462, 465-476, 552 

 protein, 36, 355-358, 364, 370, 372, 



373, 402, 405, 406, 425, 445, 452, 



499, 512, 527, 536, 636 

 protons, 208, 636 

 protoplasm, 312-318, 319-322, 355, 



392, 396, 413, 491-492, 512, 636, 

 (313, 314, 321) 



protozoa, 319-324, 453, 454, 636, 

 (323) 



harmful, 324, 393, 453-456 



useful, 322 



pseudopods, 321, 636, (321) 

 ptomaines, 445, 636 

 ptyalin, 400, 405, 636 

 pulley, 243, 247-248, 636, (247) 

 pulmonary artery, 418, 420, (418) 

 pulmonary circulation, 421, 636 

 pulse, 419, 421, 637 

 pump, 



air, 41, 170, 262, 615 



water, 52, (52) 

 punctured wounds, 482, 637 

 pupa, 542, 637, (542) 

 pupil of eye, 187-188, 637, (188) 

 Pupin, M. I., 577 

 Pure Food and Drugs Act, 374, 



388, 448, 475 

 purification of water, 53-56, 61, 



468, (56, 359, 468) 

 pylorus, 401, 637 

 pyorrhea, 411, 637 



quarantine, 457, 466, 637 



quartz, 294, 297 



questions, See Fact and Thought 



Questions and General 



Thought Questions 



