778 



INDEX. 



Retina continued. 

 duration of impression on, 605 



of after-sensations, 606 

 excitation of, 604 

 focal distance of, 600 

 fovea centralis, 588 

 functions of, 599 et seq. 

 image on. how formed distinctly, 599 



inversion of, how corrected, 609 

 insensible at entrance of optic nerve, 



588 



layers, 588 

 in quadrupeds, 590 

 reciprocal action of parts of, 617 

 in relation to direction of vision, 613 

 to motion of bodies, 613 

 to single vision, 622 

 to size of field of vision, 611 

 structure of, 588 

 vessels, 591 

 visual purple, 608 

 Rheoscopic frog, 427 

 Rhinencephalon, 698 

 Ribs, axis of rotation, 179 et seq. 

 Rigor mortis, 419 

 affects all classes of muscles, 421 

 phenomena and causes of, 420 

 Rima glottidis, movements of, in respi- 

 ration, 183 

 Ritter's tetanus, 431 

 Rods of Corti, 572 



use of, 581 



Rotatory movements, 500 

 Rouleaux, formation of, in blood, 71 

 Ruminants, 



stomach of, 245 

 Rumination, 245 

 Running, mechanism of, 426 

 Rut or heat, 646 



S. 



Saccharine principles of food, digestion 



of, 292 



Saccharoses, 749 

 Sacculus, 574 

 Saliva, 233 



composition, 234 



process of secretion, 241 



quantity, 234 



rate of secretion, 234 



uses, 235 

 Salivary glands, 231 



development of, 705 



influence of nervous system, 233, 497 



mixed, 233 



nerves, 233 



secretion, 233 



structure, 231 



true, 232 



varieties, 232 

 Saponification, 273 

 Sarcode, 1. See Protoplasm. 



Sarcolemma, 396 

 Sarcosin, 744 

 Sarcous elements, 397 

 Scala media, 572 



tympani, 572 



vestibuli, 572 

 Scheiner's experiment, 599 

 Schiff's test, 368 

 Schwann's sheath, 450 

 Sclerotic, 585 



Scurvy from want of vegetables, 213 

 Sebaceous glands, 345 



their secretion, 349 

 Secreting glands, 329 



aggregated, 330 



convoluted tubular, 330 



tubular or simple, 330 

 Secreting membranes, 326. See Mucous 



and Serous membranes. 

 Secretion, 325 



apparatus necessary for, 325 et seq. 



changes in gland-cells during, 333 



circumstances influencing, 334 



discharge of, 333 



influence of nervous system, 334 



of urine, 377 



process of physical and chemical, 332 



serous, 326 



synovial, 328 

 Segmentation of cells, 658 



in chick, 659 



ovum, 658 

 Semen, 652 



composition of, 652 



emission of, a reflex act, 489 



filaments or spermatozoa, 652 



tubes, 641 

 Semicircular canals of ear, 571 



development of, 702 et seq. 



use of, 580 

 Semilunar valves, 104 



functions of, 118 

 Semilunes of Heidenhain, 233 

 Sensation, 546 



color, 614 



common, 546 



conditions necessary to, 546 



excited by mind, 546 

 by internal causes, 546 



of motion, 549 



nerves of, 550 et seq. 



of pain, 550 



of pressure, 553 



special, 547 

 nerves of, 550 



stimuli of, 549 

 of special, 550 



subjective, 548. See also Special 

 Senses, 550 



tactile, 550 



temperature, 550 



tickling, 550 



touch, 550 



transference and radiation of, 467 et seq. 



of weight, 553 



