INDEX 



609 



Pyloric valve, 323 

 Pylorus, 196, 461 

 Pyorrhoea, S7 

 Python, 385 

 Pyura aurantium, 310 



Q 



Quadrate bone, 375, 386, 410 

 Quadrinomial, 543 

 Queen ant, 295 

 Queen bees, 291-293 

 Queen termite, 283 

 Quill, 391, 392 



R 



Rabbit, 414, 509 



brain, 410 



embryo, 520 

 Rabies, 491, 554 

 Raccoon, 413, 417 

 Races, 58, 543 

 Racial immunity, 490 



Radial canal, 129, 130, 142, 144, 193-195 

 Radial nerve cord, 193 

 Radial septum, 146 

 Radial symmetry, 51, 544, 545, 547 

 Radiata, 200 

 Radiations, 535 

 Radii, 192 



Radiolaria, 83, 512, 513 

 Radiolarian ooze, S3 

 Radius, 319, 321, 361, 388, 391 

 Radula, 219, 222, 225 

 Raja erinacea, 342 

 Rana pipiens, 373 

 Range, 499 

 Rat, 414, 421, 504 



pouched, 507 

 Rattlesnakes, 386 



skull, 386 

 Ray, 542 

 Rays, 334, 339, 341 



echinoderms, 191-196, 198, 201, 202, 205 

 Reactions, 17, 21, 66-67, 72-73, 174, 311 



(See also Responses) 

 Reactiveness, 17 

 Reasoning, 474 

 Recapitulation, law, 266 

 Recent advances, 555 

 Receptor-effector mechanism, 468 

 Receptor-effector-adjustor mechanism, 468 

 Receptors, 163, 238, 239, 327, 32S, 444, 468, 470 

 Recessiveness, 528, 531, 532, 536 

 Recognition colors, 486 

 Rectal caeca, 195 

 Rectal glands, 276 

 Rectum, 322, 323 



Red blood corpuscles, 29, 316, 324, 552 * 



Red gland, 349 

 Red spider, 302 

 Red-winged blackbird, 481 

 Redi, 25, 554 

 Rediae, 171, 172 



Reduction, 108-110, 114, 448, 528 

 division, 108, 109 



Reese, 265 



Reflex act, 163, 239, 444 



ReHex action, 163, 238-240 



Reflex arc, 239, 327, 328, 444. 468 



Reflex centers, 468 



Regeneration, 141, 163, 184, 198, 202, 205, 226, 

 237, 248, 258, 281, 374, 382, 383 



Remora, 495 



Hemora remorn, 495 



Renal artery, 339 



Renal-portal system, 339, 340, 3(i4, 380, 395 



Renal vein, 339 



Rennin, 322 



Reproduction, 17, 44-45, 67-68, 74, 103, 105-123, 

 132, 140-141, 149-151, 161-162, 168, 170- 

 174, 178-181, 186-187, 189, 198, 206, 213- 

 215, 219, 225-226, 235-236, 246, 248, 

 257-258, 263, 264, 270, 278-281, 298, 311- 

 315, 333-334, 341, 355-356, 367, 368, 371- 

 378, 383, 386, 389, 403-404, 411, 419-421, 

 442-443, 447-451, 453, 493 

 (See also Asexual and Sexual reproduction) 



Reproductive epitheHum, 96 



Reproductive system, 160-161, 235, 333-334, 395 

 (See also Reproduction) 



Reptiles, 308, 375-389, 511, 515 



Reptilia, 334, 379 



Reservoir, 79 



Respiration, 11, 35-37, 41, 42, 65, 71, 102, 131, 

 138, 161, 196, 203, 204, 211, 219, 220, 231, 

 246, 275, 276, 288, 300, 311, 323, 352, 353, 

 360, 377-378, 384, 389, 420, 439-440, 462- 

 463, 468, 487 

 (See also Respiratory system) 



Respiratory system, 276, 298, 323, 351, 408, 439- 

 440, 441 

 (See also Respiration) 



Respiratory tree, 204, 205 



Responses, 54-56, 131, 139, 149, 162, 197, 206, 

 234, 257, 264, 467 

 (See also Reactions) 



Resting cell, 47 



Resurrection bone, 551 



Reticular nervous system, 441 



Reticular structure of protoplasm, 22 



Reticulotermes flavipes, 283 



Reticulum, 416 



Retina, 223, 247 

 (See also Eye) 



Retinal layer, 332, 333 



Retinula, 255 



Retrogression, 200, 313, 543, 545, 547 



Reversibility, 13 



Rhabdites, 164, 165 



Rhabdom, 256 



Rhahdophaoa strobiloides, gall, 286 



Rhagon canal system, 130 



Rhea, 505 



Rheotropism, 55, 72 



Rhinoceroses, 416, 506, 507 



Rhizocrinus lofotensis, 206 



Rhizopoda, 78, 466 

 (See also Sarcodina) 



