INDEX 



613 



Protospongia HcKckelii, -77 1 

 Protozoa, 316 

 Pseudopodia, 75, 235 

 Psychology and physiology, 21 , 31 



task of, 39 

 Psycho-monism, 38 

 Ptomaines, 175 

 Ptyalin, 109, 154, 171, 172 

 Purposefulness in nature, 182 

 Pyrenin, 92 



Pyrophorus, luminosity of, 254, 255 

 Pythagoras, 7 



Raja, 270 

 Reactions, 355 



and stimulus, 353 



duration of, 357 



interference of, 492 

 Reflex action, 578 

 Reflex arc, 578 

 Regeneration, 486, 541 



of crystals, 528 

 Reil, 18 



Relationship, natural, 178 

 Rennet-ferment, 171 

 Reproduction, 120 



and growth, 188, 488, 531 



asexual, 190, 191 



by division, 189, 191, 531 



by fission, 191 



by gemmation, 191 



sexual, 190 



Reserve-substances, 172, 275 

 Resorption, 142, 151, 523 

 Respiration, 141, 174, 48*2 



Mayow's theory of, 15, 19, 281 

 Resurrection-plants, 223 

 Reversion. 180 

 Rheochord, 409 

 Rheotaxis, 444 



Rhizoplasma, action of temperature 

 upon, 393 



in absence of oxygen, 284 

 Rhizopoda, granular disintegration of, 

 326, 472 



ingestion and digestion of food bv, 

 152 



narcosis of, 378 

 Rhythm of cilary motion, 247 

 Rigor mortis, 133, 324, 329 

 Ritter, 19 



Rose of Jericho, 223 

 Rotation of protoplasm, 239 

 Itotatoria, desiccation of, 129 



Saccharomycex, 111, 156 



production of heat by, 258 



See Yeast-cells 

 Saccharose, 112 



Salivary corpuscles, Brownian move- 

 ment in, 220 



Salivary glands, cells of, 465, 516 



Salmon, fasting of, 277 



Salting-out, 107 



Salts, 115, 142 



Sarcode, 65 



Sarcolactic acid, 174 



Sarcolemma, 243 



Sarcoplasm, 241 



Sarcosomes, 464 



Sarkin, 108, 109, 162, 175, 305, 482 



Schleiden, 27 



Schwann, 27 



Sea-urchin, fertilisation in, 203 



Sebum, 172 



Secretion, mechanics of, 523 



Secretions, 166, 171 



protective, 172 



Selaginella, swelling movements of, 223 

 Selection, artificial, 186 



Darwin's theory of, 28, 185, 317, 573 



Empedocles's theory of, 8, 28 



natural, 8, 28, 185, 317 

 Self-regulation of metabolism, 489 

 Serum-albumin, 107 

 Serum-globulin, 107 

 Serveto, 12 

 Short circuit, 408 

 Silicic acid, coagulation of, 106 



polymerism of, 106 

 Siphonophora, 59 

 Skeletal substances, 108, 172 



excretion of, 166, 543 

 Sledge-inductorium, 411 

 Snake-charming, 495 

 Snake-poison, 176 

 Soaps, 114, 155 

 Spallanzani, 19 

 Sparrow, fatigue of ganglion-cells of, 



464 



Specialisation, danger of, 1 

 Specific energy, 21, 45, 475 

 Specific gravity, of cell, 97, 229 



of living substance, 97 

 Spermatozoa, 190 



chemotaxis of, 433, 438 



development of, 197 



discovery of, 15, 198 



forms of, 199 



rheotaxis of, 445 



structure of, 11M) 

 Sperm-cells, see Spermatozoa 

 Sperm mother- cells, 197 

 Sphcvrechinux, cross-fertilisation of, 



507 



Spinal cord, 580 

 Spinning glands, nuclei of cells of, 89, 



516 

 Spirillum, chemotaxis of, 436 



nucleus of, 67 

 Spirits, animal, 8, 10, 102 



doctrine of the, 8, 9, 10 



natural, 10 



vital, 8, 10 



