INDEX 



473 



Pappus, 38, 110, 132, 276, 277 



Paracelsus, 226 



Parallelogram of Forces, 248, 253 



Parasitology, 378, 380 



Parmenides, 59 



Pascal, 257, 282 



Pasteur, 377-382 



Pathology, 264, 377 



Pendulum, 163, 219, 248, 266, 287 



Periodic Law, 363 



Perspective, 61, 235 



Perturbation, 295, 331, 342 



Petrarch, 186 



Peurbach, 193 



Philolaus, 54 



Phlogiston, 262, 305 



Phoenicians, 13-16, 43 



Photography, 444 



Physical Chemistry, 364 



Physics, Modern, 350 



Physiologus, 175 



Physiology, 319, 376 



Pisano, Leonardo (see Fibonacci) 



Planets, 22 



Plato, 58, 69, 105 



Pliny, 146 



Pneumatics, 123 



Poincare, 339 



Polyhedra, regular, 51, 89, 90, 211 



Poncelet, 357 



Posidonius, 108, 147 



Power, 320, 439 



Priestley, 306, 309 



Prime Numbers, 89, 108 



Principia, 292, 420 



Printing, 189 



Probability, 282, 283, 284, 332 



Proclus, 38, 88, 90, 92, 119 



Projection, 122, 132, 242 



Projective Geometry, 280 



Protoplasm, 375, 391 



Ptolemy, Il9, 126, 138, 176 



Pumps, 246, 257 



Pyramids, 29, 32, 44 



Pythagoras, 49, 90, 310 



Quadrants, 163, 206 



Quadratic Equations, 65, 89, 134, 162 



Quadrivium, 50, 148, 174 



Rainbow, 292, 402 



Ramus, 210, 213 



Ray, 316, 369 



Recorde, 202, 236 



Reductio ad absurdum, 65, 67 



Refraction, 132, 163, 181, 215, 265, 266, 



283, 287, 292, 327 

 Refrigeration, 445 



Regiomontanus, 191, 193 

 Reinhold, 201 

 Renaissance, 172, 185 

 Retrogressions, 118 

 Rheticus, 196, 241 

 Romer, 266, 286 

 Royal Society, 268, 269 

 Rumford, 312, 322, 350, 357 

 Rutherford, 306 



Sacrobosco, 180 

 St. Hilaire, 372 



Saturn, Rings of, 223, 266, 286 

 Sauveur, 311 

 Scheele, 30.8, 334 

 Scholasticism, 155, 174 

 Seebeck, 354 

 Seleucus, 117 

 Servetus, 227 

 Sewing-machine, 442 

 Slide-rule, 245 

 Smith, 317 

 Snellius, 266 

 Socrates, 69 

 Sophists, 64 

 Spallanzani, 320, 382 

 Sound, 250, 310 

 Spectroscope, 353 

 Spectrum, 266, 353 

 Spinning Jenny, 441 

 Spirals, 99 



Spontaneous Generation, 381 

 Stahl, 262 



Stars, Distance of, 116, 209, 303, 344 

 Steamboat, 442 



Steam-engine, 258, 312, 320, 440 

 Steel, 446 

 Stevinus, 252 

 Stifel, 235, 242 

 Strabo, 145, 147 



Sun-dial, 28, 29, 39, 45, 134, 148 

 Sydenham, 264, 377 



Symbols, 159, 184, 231, 233, 236, 237, 

 240, 245, 277, 301 



Tables, astronomical, 128, 165, 176, 193, 



201, 215 

 Tartaglia, 237 

 Telegraph, 445 

 Telephone, 445 

 Telescope, 215, 219, 229, 266, 267, 291, 



313 



Thales, 42 

 Theeetetus, 70, 88 

 Theon, 38, 90 

 Theophrastus, 46, 47, 84 

 Thermodynamics, 351, 365 

 Thermometer, 249, 267 



