INDEX 



469 



Variability; of the given, 49-50, 131- 

 3; of levels of abstraction, 245-8. 



Venn, J., 112 n. 



Verification, 107, Chap. XI; as pre- 

 diction, 218-23; compared with 

 discovery, 107, 218, 225; confirma- 

 tory-infirmatory movement of, 

 223-30; experiments of, 107, 225; 

 Mill's methods of, 226-7; nature of, 

 218; observational and experi- 

 mental, 225-6; see Hypothesis. 



Vienna circle, see Logical positivists. 



Wallas, G., 178, 194. 

 Watt, J., 176. 



Weyl, H., 460. 



Whitehead, A. N., 28, 60, 61 and 

 n., 70 n., 132, 148, 172, 278, 

 299, 311, 346, 351, 352, 353, 354. 



Wittgenstein, L., 11, 12, 73, 77, 148, 

 172, 253. 



Wolf, A., 213, 230. 



Wolff, C, 5. 



Woodworth, R. S., 179, 194. 



Words, 67, 72. 



Young, J. W., 213, 265 n., 269 n M 

 278, 363 n. 



Zeno, 321. 



