142 
Red pigment, z. 
Refractory period, 48; absolute 
phase of, 48; conditions affect- 
ing, 48; relative phase of, 48. 
Respiration, definition of, 10; 
as fundamental to vital process, 
II. 
Respiratory metabolism, how to 
study, 15. 
Resting metabolism. See metab- 
olism. 
Riggs, 42. 
Ringer’s solution, 28. 
Rdfleston, 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, 91; 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. 
production. 
See Carbon dioxide 
A CHEMICAL SIGN OF LIFE 
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. 
Thérner, 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. 
production. 
Viscera, nerve to, 18. 
Voluntary muscle. See Muscle. 
See Carbon dioxide 
Waller, 11; metabolism of nerve, 
12; on blaze current, 5; on 
changes of electrical resistance, 
tor; on longevity of nerve, 24; 
on protoveratrin, 48; on stair- 
case, 13. 
Water, as end product of metab- 
olism, 11. 
Weston cell, 52. 
Yohimbin, on refractory period, 
48. 
