972 



INDEX. 



Snoring 133 



Sobbing 125, 135 



Solar plexus 733 



Solitary glands of the intestine 264, 267, 291 



Sominering, yellow spot of 776 



Soprano 556 



Sound, physics of 823 



laws of vibrations of. 824 



propagation of &25 



reflection of. 825 



refraction of 825 



shadows of 85 



rapidity of transmission of. 825 



noisy and musical 826 



pitch of. 826 



range of, in music 826 



musical scale of 827 



quality of. 828 



harmonics, or overtones 829 



resultant tones 831 



summation tones 832 



harmony 832 



chords 832 



discords 833 



beats 833 



tones by influence (consonance) 834, 837 



Sounds of the heart 48 



Soups, digestibility of. 251 



Spasm, artificial 539 



Speech, mechanism of 560 



action of the mouth, teeth, lips, tongue, and pal- 

 ate in 562 



modifications of, in cases of cleft palate or hare- 

 lip 562 



Spermatic cells 886 



Spermatic cord 880 



Spermatiue 884 



Spermatozoids 884 



discovery of 884 



movements of. 885 



intermediate segment of 885 



action of water, reagents, cold, heat, etc., upon . . 885 



development of 885 



in advanced age 886 



duration of the vitality of, in the female genera- 

 tive passages 893 



penetration of, through the vitelline membrane.. 896 



Spheno-palatine ganglion 731 



Spherical aberration 789 



Sphygmograph 72 



Sphincter of the bladder 408 



Sphincters of the anus 296-298 



Spices 190 



Spina bifida .* 915 



Spinal accessory nerve 627 



physiological anatomy of. 627 



small, internal, or communicating branch of, to 



the pneumogastric 628 



properties and functions of. 628 



functions of the internal branch of 629 



extirpation of, in living animals 629 



influence of, upon phonation 629 



influence of, upon deglutition 681 



influence of, upon the heart 631, 655, 658 



functions of the external, or muscular branch 



of, going to the sterno-cleido mastoid and trapezius 



muscles 631 



Spinal column, development of. 915 



twisting of, in the embryon 915 



PAGE 

 Spinal column, temporary caudal appendage of ...... 915 



Spinal cord, arrest of the action of the heart by sud- 

 den destruction of ............................... 59 



lymphatics of ................................. 306 



- regeneration of. ............................... 58(> 



- neurilemma of ................................ 667 



physiological anatomy of. ..................... 66S 



- filum terminale of. ............... ............. 669 



proportion of white to gray substance in differ- 

 ent portions of. ................................. 669 



- direction of the fibres in ....................... 671 



- connections of, with the roots of the nerves ..... 672 



- general properties of .......................... 673 



- excitable and sensible portions of. ............. 674 



- transmission of motor stimulus in .............. 676 



- direction of motor conductors in ................ 676 



-- decussation of the motor conductors of ......... 676 



- transmission of sensory impressions in ......... 677 



the posterior white columns of, do not serve as 

 conductors of sensory impressions ................ 678 



conduction of sensory impressions by the gray 

 Bubstance of ..................................... 678 



- function of, in connection with muscular coordi- 

 nation ...................................... 679, 711 



- decussation of the sensory conductors of. ....... 680 



hyperoesthesia due to injury of portions of. ...... 680 



- summary of the action of, as a conductor ....... 682 



- action of, as a nerve-centre ..................... 683 



- reflex action of (see Eeflex action) ............... 684 



dispersion, or diffusion of impressions in ........ 685 



-- development of. ............................... 917 



Spinal nerves, distinction between motor and sensory 



roots of ........................................ 587 



- properties of the posterior roots of ............. 589 



- properties of the anterior roots of ............. 590 



- distribution of ................................ 606 



- connections of, with the spinal cord ............ 672 



Splanchnic nerves .................................. 733 



Spleen, relations of, to the blood -corpuscles .......... 13 



- proportion of leucocytes in the blood of the veins 



of. .............................................. 15 



-- physiological anatomy of ....................... 473 



- fibrous structure of (trabeculae) ................ 474 



- Malpighian bodies of .......................... 474 



- spleen-pulp ................................... 475 



- blood-corpuscle-containing cells of. ............. 475 



- blood-vessels and nerves of .................... 475 



- contractility of .......... ...................... 476 



- chemical constitution of ....................... 476 



- functions of. .................................. 477 



- changes in the constitution of the blood by ..... 477 



- variations in the volume of. .................... 477 



-- extirpation of. ................................ 478 



- influence of extirpation of, upon the appetite and 

 disposition ...................................... 478 



- development of ............................... 921 



Splenic plexus ..................................... 733 



Spores 



Spurzheim, brain of 

 Stapedius muscle 

 Stapes 



856 



821 

 819 

 Starch ............................................ 181 



- iodine-test for ................................. 181 



- proportion of, in different vegetables ............ 181 



- action of the parotid saliva upon ................ 206 



- general action of the saliva upon ................ 212 



-- action of the gastric juice upon, by hydration. . . 248 



- action of the intestinal juice upon .............. 267 



- action of the pancreatic juice upon ............. 275 



