292 



INDEX 



Correlation, physiological : organ- 

 ismic and protoplasmic, 11; 

 three groups of, 12 



Correlation, transmissive, 15. See 

 also Transmission 



Correlation, transportative, 10, 12, 

 13. See also Correlation, chemi- 

 cal 



Cortex, cerebral: pyramidal cells 

 of, 162, 166, 171; origin of, in 

 relation to upward nerve paths, 

 261; physiological characteris- 

 tics of, 263; electrical conditions 

 as factor in development of, 263 



Crystal: organism as, 8; specific 



forms of haemoglobin, 8 

 Cyanide, potassium, action of, 29 

 Cyclopia, as differential inhibition, 

 38 



Decrement, 67. See also Excita- 

 tion; Transmission 

 Dedifferentiation: in consequence 

 of physiological isolation, 103, 

 limitation of, in higher forms, 

 105; in relation to tumors, 105 

 Dendrite, chaps, x, xi; in relation 

 to functional irreversibility of 

 reflex arc, 228 

 Dendrocoelum, head formation in 



pieces of, 134 

 Depolarization, electric. See Po- 

 larization, electric 

 Differentiation: of organismic 

 magnitude, 5; as a basis for 

 chemical correlation, 14; in re- 

 lation to susceptibility, 34; of 

 nucleus, 61 ; in relation to physi- 

 ologicaJ gradients, 90; in rela- 

 tion to rate of intake and oxida- 

 tion, 92; in animal egg, 94; in 

 relation to symmetry, 96; of 

 nervous structure in relation to 

 physiological gradients, 108, 

 [13, 115, 246; course of, along 

 axes, 119, of neuron, chaps, x, xi; 

 of receptor, conductor and effec- 

 tor, 238 



Dominance, physiological: in rela- 

 tion to physiological gradients, 

 97, 100; independent of nervous 

 system, 99; in plants, 99; in 

 Planaria, 100; persistence of, 

 independent of gradient, 102; 

 range and limit of, 102, 104; as 

 physiological independence, 118; 

 in ctenophore plate row, 212; in 

 vertebrate heart, 221; in rela- 

 tions of neurons, 230; in anne- 

 lids, 249; change in character of, 

 in higher vertebrates, 259; in 

 cerebral cortex, 266. See also 

 Gradients, physiological 



Effector: ctenophore plate row 

 not a pure, 214; as part of reflex 

 arc, 233; in primitive gradient, 

 234, 245; in neuro-muscle cell, 

 240; of sponges, 240; physiologi- 

 cal impossibility of a pure, 241 



Electro tonus, 180 



Epigenetic theory, 8, 9 



Equisetnm, determination of polar- 

 ity by light in spores of, 51 



Excitation: in physiological corre- 

 lation, 15; nature of, 16, 67, 76, 

 82, 207; as general characteris- 

 tic of protoplasm, 67; quantita- 

 tive relations in, 68, 74, 81; 

 "all-or-none," 68, 75. 81 , 99, 

 208,223; theories of, 70; rever- 

 sibility of, 75, 80, 82; primitive 

 process of, 75, 80; specialization 

 of mechanisms of, 79, 207, 260; 

 in relation to physiological gradi- 

 ents, 82; as basis for qualita- 

 tive changes, 93; in relation to 

 nervous function, 107; develop- 

 ment of, 207, 228; rhythmic- 

 ity in, 208, 213; in neurons of 

 different levels, 230, 258. See 

 also Gradients, physiological; 

 Transmission 



Fucaceae, determination of polar- 

 ity by light in, 51, 60 



