Secretin, 425 



chemical nature of, '426 



mechanism of action of, 420 

 Secretion (see under various glands) 



general considerations, 418 

 Segmental distribution of nerves, 837 

 Segmentation movements, 463 

 Segmented invertebrates, nervous system, 



783 

 Semicircular canals, 873 



eye movements and, 875 

 removal of, 874 

 Semilunar valves, 150, 155 

 Semipermeable membrane, 4 

 Sense, temperature, 791 



touch, 793 



pain, 795 



Sensory centers, 850, 851 

 Serine, 603 

 Serum albumin, 87 

 Serum globulin, 87 

 Sex, effect on creatinine excretion, 624 



effect on energy output, 541 

 Sham feeding, 435 

 Shell shock, 287 

 Shock, 287 



anesthetic, 288 



blood pressure in, 290 



experimental investigations, 289 



gravity, 287 



hemorrhagic, 288 



nervous, 289 



recovery from, 805 



secondary symptoms of, 295 



spinal, 288, 803 



surgical, 289 



treatment of, 295 



vasomotor control in, 290 

 Sinoauricular node, 185, 266 

 Sinus arrhythmia, 266, 277 

 Sinus bradycardia, 266, 277 

 Skatole, 501, 632 



in urine, 531 



Skeletal muscle, respiration in, 394 

 Skin, receptors of, 790 

 Soap, 686 

 Sodium ions, 166 

 Solution of gases, 336 

 Solutions : 



gas laws and, 3 



gram molecular, 5, 22 



hypertonic, hypotonic, and isotonic, 6 



nature of, 3 

 Sorensen method for estimating amino 



groups, 599 

 Sounds, cardiac, 157 



recording of, 158 

 Specific conductivity, 17 

 Specific dynamic action, 538 

 Specific gravity of urine, 522 

 Sphingomyelin, 689 

 Sphygmic period, 273 

 Sphygmograph, Dudgeon's, 201 



Spinal animal, 804 

 Spinal column, 786 

 Spinal cord : 



ablation of, 839 



in laboratory animals, 803 

 in man, 806 



hemisection of, 831 



sensory pathways in, 830 



successive degeneration in, 813 

 Spinal pathways, afferent, 830 

 Spinal shock, 803, 807 

 Spirometer, 556 



Splanchnic circulation in shock, 292, 294 

 Splanchnic nerve, 233, 672 

 Sponges, nervous system of, 782 

 Stalagmometer, 65 

 Standard of neutrality, 26 

 Standard solutions, preparation of, 34 

 Stannius' ligature, 176 

 Starvation, 566 



acidosis during, 569 



cause of death, 570 



effect of creatinine excretion, 625 



energy output during, 568 



excretion of nitrogen, 566 



loss of weight, 568 



nitrogenous metabolism, 568 



purines during, 569 



secretion of gastric juice during, 476 



sensations during, 475 



sulphur during, 569 



treatment of diabetes, 684 

 Statistical method, in diet control, 589 

 Stearic acid, 687 

 Stokes-Adams syndrome, 193 

 Stomach: 



arrangement of food in, 455 



digestion in, 481 



emptying of, 456 



effect of pathological conditions on, 



460 

 rate of, 458 



gas in, 462 



miniature, 433 



movements of, 451 



effect on food, 454 

 Stroma of red cell, 91 

 Stromuhr, 207 

 Strychnine, action on reciprocal inhibition, 



819 



Subarachnoid space, 116, 248 

 Subcostal angle, 321 

 Subcostal borders, 321 

 Subdural space, 116 

 Submicrons, 54 

 Substantia-gelatinosa, 831 

 Successive induction, 824 

 Successive regeneration, 813 

 Sugar, storage of, 662 

 Sugar level in blood, 657 

 Sugar metabolism (see Carbohydrates), 



652 

 relation of pancreas to, 678 



