INDEX 



JBO-matrix, 243 

 Robinson, E. S., 194, 199 

 Rosenblueth, A., 71 

 Runaway, 52 



Sea- anemone, 140, 156 

 Selection of fields, 91, 106 

 Self-correction, 54 

 Self-destruction, 5 

 Sense-organs, dispersion in, 169 

 Separation, 153, 160 

 Serum, 20 



Servo-mechanism, 51 

 Sex hormone, 122 

 Shannon, C. E., 211, 215 

 Sherrington, C. S., 137, 138 

 Shivering, 58 



Simple harmonic oscillator, 80 

 Skaggs, E. B., 194, 199 

 Skin, 169 



Skinner, B. F., 190, 199 

 Snail, 152 

 Snake, 135 

 Sommerhoff, A., 71 

 Species, 8 

 Spectrum, 30 

 Speidel, C. C, 127, 129 

 Sperry, R. W., 117, 124 

 Spider monkey, 118 

 Spinal cord, transection, 159 

 Spinal reflexes, co-ordination between, 

 196 



interaction between, 137 

 Spontaneity, 88 

 Stability, 47, Chapters 4 and 20 



and parameter change, 78 



examples, 55 



is holistic, 54 



nature of, 76 



of homeostat, 96, 220 



probability of, 56, 100, 136, 165, 221 

 Stalking, 132 



Starling, E. H., 37, 42, 64 

 State, 18, 203 



equality of two, 19 

 State-determined system, 25 

 Statistical machinery, 145 

 Steady state, 43 

 Stentor, 103 

 Step-function, 80, Chapters 7 and 22 



and natural selection, 123 



effect of omission, 88 



in Stentor, 105 



in the organism, Chapter 10 



nature of, 111 



necessity of, 110 



number necessary, 128 

 Stepping switch, 96 

 Stimuli, 



addition of, 167 



Stimuli, and part-functions, 166 



numericising, 30, 76 



repeated, 147 



response to, 57 

 Strychnine, 130 

 Subjective phenomena, 10, 32 

 Subspaces, 87, 163 

 Subsystems, 171, 181 

 Surface, critical, 234 

 Surgical alterations, 117 

 Survival, 42, 65, 197 

 Swallow, 17 



Switch, as step-function, 81 

 Switching, and part-function, 161 

 Symbols, collected, 253 

 System, 15 



absolute, 24, Chapter 19 



containing null-functions, 86, 228 



— part-functions, 163 



— step-functions, 86 

 hour-glass, 161, 251 

 independence of, 156 

 infinite, 203 

 linear, 215 

 regular, 23, 204 

 symbols for, 203 

 stability of, 48 

 with feedback, 39 



Tabes dorsalis, 38 

 Tadpoles, 127 

 Taste, 169 

 Teleology, 9, 71 

 Telephone exchange, 161 

 Temperature, homeostasis of, 58 

 Temple, G., 27, 28 

 Temporal cortex, 170 

 Terminal field, 91 



normality, 146 

 Thermostat, 43, 51, 53, 54, 67, 156 

 Thirst, 59 



Threshold, 163, 170 

 Thunderstorm, 17 

 Time, 



as variable, 15 



for adaptation, 135, 141, 177, 184 

 Tissue culture, 126 

 Tokens, as reward, 186 

 Tongue, 7, 39 

 Training, 112, 187 

 Transducer, 121 



noiseless, 211 

 Transformations, 168 

 Transient, 144 

 Trap, 132 

 Tremor, 67 



Trial and error, 112, 132, 174 

 Trials, number of, 238 

 Type-problem, 11 

 Typewriter, 154 



259 



