INDEX 757 



Selenium, response of, 3 



Sensation, conversion from positive to negative by tetanisation, 665 

 ,, different tones of, 646 

 ,, dual elements in, 674 

 ,, effect on, of attention and inhibition, 652 

 ., effect on, of molecular disposition, 663, 664 

 ,, effect on, of progressive molecular change in nerve, 66 1 

 ,, identification with opposite nervous changes, 650 

 ,, interchange of pleasurable and painful under electrotonus, 670-672 

 ,, negative element in, blocked by anaesthetics, 673 

 ,, positive and negative, 664 

 ,, positive simple, negative complex, 665 

 Sensimeter, 670 

 Shoshungraph, 368 



Skin, abnormal response converted to normal after tetanisation, 311 

 ,, response of, in frog, 300, 302 

 ,, in gecko, 310, 311 



,, ,, in grape, 299, 301, 302 



,, ,, in intact human, 300 



in tomato, 307, 308, 309 

 ,, ,, in tortoise, 307 



Snail, foot of, response in, 316 



,, ,, resting current and its variation in, 318 



Staircase response, 91, 103, 522,524, 625, 635 

 Stimulants, action of on inorganic response, 8 

 Stimulation, by chemical agents, 27 



,, by equi-alternating electric shocks, 277 



,, by taps, 26 



,, by tension and compression, 25 



,, by thermal shocks, 24 



,, effect of moderate, on conductivity, 504 



,, ,, of strong, on conductivity, 505 



,, instantaneous mechanical, 47 



,, response to various forms of, 24-27 



,, ,, to increasing intensity of, 40 



,, rotary mechanical, 291 



,, vibratory, 27 



Stimulator, electro-thermic, 38 



vibratory, 30 



Stimulus, effect of, on growth, 73 



importance of, seen in ascent of sap, 382, 555 



M ,, ,, autonomous response, 212, 555 



growth, 556 



5 5, ,, motile excitability, 554 



,, opposite effects of, on highly tonic and sub-tonic tissues, 77 

 ,, relation between, and response : 

 M ,, in plant-tissue, 40, 41 



j ,, in nerve of bull-frog, 658 



,, ,, in nerve of fern, 659 



