888 Index 



Rays, 141,* 301, 301,* 303, 307,* 



328,* 331 

 medullary, 222 

 sting, 329* 

 Reaction, 348, 352,* 355,* 359 • 

 Recapitulation, 442, 854 

 Receptacle, 161, 208, 216, 224, 225* 

 Recessive, 682, 684 

 Records of ancient life, 605-619 

 Rectal gland {see Glands) 

 Recti muscles, 497,* 498,* 505 

 Rectum, 308,* 313,* 315,* 327,* 380,* 



381, 394, 396,* 403,* 404, 



471,* 477 

 Red blood corpuscle {see Tissues, 



blood) 

 Redi, Francesco, 733, 801 

 Redia, 375,* 377, 787* 

 Reduction division, 607, 709, 854 

 Reef, 536 

 Reflex, 503, 505 

 Refraction, 730, 759 

 Regeneration, 98, 98,* 293, 299, 304, 



372, 373, 576, 579 



Renal, 483, 493, 494 



Rennin, 476 



Reproduction, 96, 102 {see also specific 



organisms) 

 Reptilia (reptiles), 333, 336*-338,* 



573 

 Reservoir, 276,* 358,* 358, 359 

 Resin, 262, 263 



Respiration, 100, 239, 306,* 310,* 318, 

 319, 489-492 {see also specific 

 organisms) 



Respiratory tree, 74, 75,* 306* 



Resting stage {see Mitosis) 



Reticular theory, 74, 75* 



Retina, 438, 456,* 497, 497,* 505 



Retractor muscle, 312,* 313,* 384 



Reversion in heredity, 855 



Rh factor, 525 



Rhabdite, 293, 368 



Rhabdom, 398 



Rhabdopleura, 327, 327* 



Rheita, 29 



Rheotropism, 855 



Rhizobium, 650 



Rhizoid, 125, 126,* 130, 131,* 132,* 

 133, 134,* 136, 137,* 138,* 

 173, 186-189, 193-198 



Rhizome, 135, 137,* 138,* 139,* 192- 



198, 197* 

 Rhizoplast, 359 



Rhizopoda, 274 {see also Protozoa) 

 Rhizopus (black bread mold), 124,* 



125, 173, 671 



Rhodophyta (red algae), 109, 118, 

 119,* 153, 162-165, 163,* 249 

 Rhomaelia {see Grasshopper) 

 Ribs, 462,* 466 

 Richards, 34 

 Rickets, 475 

 Riddell, 31 



Ringworm {see Athlete's foot) 

 Rockweed (Fucus), 118, 118,* 161 

 Rods and cones, 497 

 Root, 133-148, 137,* 140,* 144,* 147,* 

 191-198, 200-205, 206-218, 

 219-222 



absorption by, 226 



cap, 215, 219 



hairs, 'l45,* 210, 216, 219, 226 

 pressure, 227 



regions of growth, 219-222 

 tissues {see Tissues, plant) 

 ventral, 55* 



Rotifer, 297, 298, 299,* 539, 540 

 Roundworm, 379-382, 661, 788 {see 



also A s c a r i s ; Hookworm ; 



Trichinella, etc.) 



Royal jelly, 407 

 Rubber, 262 

 Ruska, 35 

 Rusts, 129, 181, 182* 



Sac, embryo, 206 

 Saccharomycetes {see Yeast) 

 Sacculus, 496 

 Sachs, Julius, 803 

 Salamander, 333, 334* 

 Salivary gland, 311,* 312,* 498 

 Sand dollar, 303, 305* 

 Sandworm (Nereis), 307,* 308, 541 

 Saprolegnia (water mold), 125, 173, 

 174* 



Saprophyte, 113, 120, 123, 151, 168, 



172, 173, 176, 177, 635, 658, 



671 

 Sarcodina, 274, 275,* 343,* 531,* 533* 



{see also Protozoa) 

 Sarcolemma, 52,* 53 

 Savory substances from plants, 267 

 Sawfish, 329* 

 Sawfly {see Insects) 

 Scale, 331 



insects, 558, 560* 

 Scallop, 311 



Scaphopoda, 311, 316* 

 Schistosoma, 660, 661 

 Schizogony, 367 

 Schizomycophyta (bacteria), 109, 120- 



122, 121,* 167-172, 250-256 



