142 



A CHEMICAL SIGN OF LIFE 



Red pigment, 2. 



Refractory period, 48; absolute 

 phase of, 48; conditions affect- 

 ing, 48; relative phase of, 48. 



Respiration, definition of, 10; 

 as fundamental to vital process, 

 n. 



Respiratory metabolism, how to 

 study, 15. 



Resting metabolism. See metab- 

 olism. 



Riggs, 42. 



Ringer's solution, 28. 



Rolleston, 50. 



Salts: permeability of, to nerve, 

 8; effects on nerve impulse, 82; 

 Ringer's solution, 28; sodium, 

 on metabolism, 43. 



Sciatic nerve. See Nerve. 



Secretion, 8. 



Seeds: blaze current in, 5, 88; 

 chemical signs in, 88; dete- 

 rioration of, 87; effect of 

 anesthetics on, 91; electrical 

 sign in, 5, 88; increased metab- 

 olism of, on injury, 90; 

 invisible response in, 4; metab- 

 olism in killed, 01; old Egyp- 

 tian, 88; psychic life in, 3; 

 vitality of, at low temperature, 

 87. 



Sensory dendrite. See Dendrite. 



Sensory nerve. See Nerve. 



Sheath. See Medullary sheath. 



Sisyphus, 84. 



Skate. See Raia. 



Smooth muscle. See Muscle. 



Snyder, 51. 



Sodium chloride, 42. 



Spider Crab. See Carbon dioxide 

 production. 



Squiteague. See Carbon dioxide 

 production. 



Staircase, 14. 



Stewart, 50. 



Stimulation: Chemical, 40; effect 

 of repeated, on electrical changes 

 14; electrical, 37; injury as, 91; 

 mechanical, 41, 91; other stim- 

 ulations, 39. 



Stomata, 92. 



Surface tension, 8. 



Tait, 48. 



Turtle, 22. 



Temperature: effect on nerve 



impulse, 82; effect on nerve 



metabolism, 83. 

 Thorner, 45. 

 Transmission, of excitability. See 



Nerve impulse. 

 Twelfth dynasty, 88. 



Universe, 2. 



Unstable equilibrium, 105. 



Urethane. See Ethyl urethane. 



Velocity: its relation to resting 

 metabolism, 80; of the nerve 

 impulse, different salt concen- 

 tration on, 82; of various crus- 

 tacean nerves, 81; temperature 

 on, 83. 



Vertebrates. See Carbon dioxide 

 production. 



Viscera, nerve to, 18. 



Voluntary muscle. See Muscle. 



Waller, u; metabolism of nerve, 

 12; on blaze current, 5; on 

 changes of electrical resistance, 

 101; on longevity of nerve, 24; 

 on protoveratrin, 48; on stair- 

 case, 13. 



Water, as end product of metab- 

 olism, ii. 



Weston cell, 52. 



Yohimbin, on refractory period, 

 48. 



