758 



INDEX 



Spermatids, 715 

 Spermatocytes, 715 

 Spermatogonia, 715 

 Spermatozoa, 715, 716, 719 

 Spermin, 460 



Spherical aberration, 683, 707 

 Sphygmogram, 228 

 Sphygmograph, 226 

 Sphygmomanometer, 216 

 Sphygmometer, 227 

 Spinal accessory nerve, 622 

 bulb, 567 

 centers, 557, 558 

 cord, 541 



antero-lateral ascending 



tract, 548 



descending tract, 548 

 arrangement of nerve cells 



in, 543 

 ascending degeneration of, 



548 



comma tract of, 548 

 conduction in, 561 

 course of motor impulses in, 



563 

 of sensory impulses in, 



562 



crossed pyramidal tract, 547 

 descending degeneration of, 



547 



direct cerebellar tract, 548 

 pyramidal tract, 547, 



548 



fasciculi of, 546 

 functions of, 541, 545, 551 

 Gowers' tract, 548 

 hemisection of, 564 

 intrinsic cells in, 545 

 irradiation of impulses in, 



554 



peculiarities of different re- 

 gions, 551 



reflex action in, 551, 557 

 reticular formation, 545 

 tracts of, 546 

 weight of, 593 



nerve-roots, functions of, 555 



nerves, 549 



anterior roots, 550, 555 

 course of fibers, 550 

 posterior roots, 550, 555 



reflexes, 556 



Spirem, 20 



Spleen, vascular nerves for, 246 



Spongioplasm, 8, 18 



Staircase contractions, 486 



Stammering, 522 



Starch, 101 



action of amylopsin on, 363 



of ptyalin on, 337, 338, 379 



chemical reactions of, 113 



hydrolysis of, 113 

 Starvation, 447 



death from, 447 



effect on body temperature, 448 



symptoms of, 448 

 Steapsin, 328, 360, 363 

 Stercobilin, 368 

 Stereoscope, 702 

 Stethograph, 280 

 Stethometer, 279 

 Stimuli, forms of, 472 



maximal, 485, 526 



minimal, 485, 526 

 Stokes' fluid, 138 

 Stomach, 341 



absorption from, 389 



action of pylorus, 354 



blood-vessels of, 345 



changes in glands during secre- 

 tion, 346 



digestion in, 339, 341, 353 



gases in, 375 



glands of, 344 



lymphatics of, 345 



movements of, 353 



nerves of, 342 



nervous control of movements 

 of, 354 



peristalsis of, 354 



secretion in, 346 



structure of, 342 



vascular nerves for, 246 

 Stomata, 25 

 Strabismus, 61 1 

 Stratum granulosum, 419 



lucidum, 419 



Malpighii, 419 

 Striated muscle, 60 



development of, 64 

 Submaxillary gland, action of atro- 



pine on, 33 i 



paralytic secretion of, 332 

 secretion of, 333 



