140 



A CHEMICAL SIGN OF LIFE 



Horseshoe crab. See Limulus 

 polyphemus. 



Hydrogen, 26, 60; decreased 

 metabolism in 44; lack of in- 

 creased metabolism in, 44. 



Hydrolysis, 52. 



Hypoglossal nerve. See Nerve. 



Impulse: in plant, 2; nerve, see 

 Nerve impulse. 



Inhibition: by heat, 58; non- 

 transmissibility of, 58. 



Injury, 41, 91. 

 Insect, wings of, 47. 

 Invertebrate, 18. 

 Irritable response, 103. 



Irritability: definition of, 4; 

 metabolic condition for, 85; 

 nature of, 104; origin of physi- 

 cal theory of, 9; relation of, to 

 conductivity, 57; relation of, to 

 metabolism, 104; two phases in 

 protoplasmic, 57. 



Katabolism, 48. 



King crab. See Limulus poly- 

 phemus. 



Lateral line nerve. See Nave. 



Lavoisier, n. 



Learning, phenomenon of, 35. 



Lens, 15, 16. 



Libinia canaliculata. See Carbon 



dioxide production. 

 Life: chemical sign of, chap, v; 



definition of, 95; quantity of, 



107. 



Light, 35. 

 Limax, 22. 



Limulus. See Limulus polyphemus, 

 Limulus polyphemus. See Carbon 



dioxide production. 

 Living process, 103; material 



changes in, 3; physical state of, 



105. 

 Living things : property of, 3 ; two 



signs of, 4. 

 Lobster. See Homarus vulgaris. 



Man. See Carbon dioxide pro- 

 duction. 



Mathews, 35, 41. 

 Mayer, 82. 

 Mayow, u. 



Medullary sheath, 51, 58; func- 

 tion of, 18. 



Medullated nerve, 18, 21. See 

 also Carbon dioxide production. 

 Memory, 35. 



Metabolic gradient. See Gra- 

 dient. 



Metabolism: function of, 85, 104; 

 increased, on stimulation, 34; 

 in different tissues and organ- 

 isms, see Carbon dioxide pro- 

 duction; indirect evidence for, 

 in nerve, 12; its meaning, 50, 

 104; method of study of, in 

 nerve, see Biometer; relation to 

 behavior, 81; resting, 33, 89. 



Methylene blue, 37. 

 Motor nerve. See Nerve. 

 Mouse, 22. 



Muscle: acid production in, 91; 

 contraction of, as sign of nerve 

 impulse, 23; increased metab- 

 olism of contracting, 35; 

 smooth, 51; voluntary, 18. 



Narcosis. See Anesthesia. 

 Narcotics. See Anesthetics. 

 Negative phase, 13. 



Negative response, influence of 

 carbon dioxide, 14. 



Nerve: afferent, 58; claw, 18; 

 efferent, 58; hypoglossal, 79; 

 lateral line, 22; motor, 21; 

 oculomotor, 21; olfactory, 21; 

 optic, 22; sciatic, 21, 22, 67; 

 sensory, 22, 58; nerves of 

 different animals. See also 

 Carbon dioxide production. 



Nerve fibers: Changes of weight 

 under anesthesia, 62, 65; chem- 

 ical change in, chaps, ii and iii; 

 chemical sign of, 55; different 



