578 



PROTOPLASM 



Phosphorus, 431 

 Photoelectric effect, 393, 404 

 Photo luminescence, 416 

 Photons, 396, 400 

 Physiological units, 9 

 Phyosterol, 464 

 Pictet, 455 

 Pigments, 516 



anthocyanins, 516, 517 



carotene, 516 



chlorophyll, 516 



cytochrome, 516, 518, 519 



flavins, 517 



flavones, 517 



hemoglobin, 517 



xanthophyll, 516 

 Pituitary gland and sulphur, 432 

 Planck, 396 

 Plankton, 37 

 Plant cell, as an osmotic system, 12, 



15, 20, 193 

 Plasma, 74 



blood, 70 



membrane, 275 

 Plasmodesmata, 32 

 Plasmodium, 3, 40 

 Plasmolysis, 16, 61, 182 



definition, 194, 195 

 Plastic liquids, characteristics of, 



227 

 Plasticity, 227 

 Plastid, 18 

 Plastidules, 9 

 Platelets, blood, 494-495 

 Plowe, elasticity, 448 



lyotropy, 448 



microinjection, 64 



tonoplast, 278 

 Pneumococci, cataphoresis of, 382 

 Podura, 163 

 Poggendorff, 313 

 Point, isoelectric, 375 

 Poiseuille, 210 



Poiseuille's formula, 224-225 

 Poison, catalytic, 428 



metals, 428 

 Polarity, 256-260 



importance of, 257 



Polarity, kinds, 257 



molecular, 289 



water molecules, 260 

 Polarization, 340 

 Polarized light, 406 

 Polymorphism, definition, 78 

 Polyneuritis, 514 

 Polji-pep tides, 471-474 

 Porter, 528 

 Portunus, 450 

 Positron, 398, 400 

 Potassium, 430 

 Potentials, 339 



between cell parts, 353 



versus charge, 372 



concentration, 340 



critical, 377 



current flow, 343 



diffusion, 340 



electrode, 339 



electrokinetic, 361, 362, 368 



general, 339, 353 



injury, 352 



liquid junction, 341 



maximum in organisms, 355 



membrane, 348-352 



oxidation-reduction, 341, 342, 348 



plant, 378 



polarization, 340 



stream, 358 



thermodynamic, 370 



tree, 356 

 Potentiometer, 313 



definition, 314 

 Powis, 376 

 Pragmatism, 536 

 Prdt, 257 

 Precipitation, 138, 480 



of colloidal matter, 110 

 Priestley, 341 

 Primitive form, 1 

 Probability principle, 401 

 Proctor, gelatin structure, 261 



imbibition versus osmosis, 204 

 Propionic acid, 472 

 Protective colloids, 147 

 Protective medium, 72 



I 



i 



