250 



INDEX 



Westinghouse Electric Company, 



207 

 Wharton, Thomas, 168 

 Whitehead, A. N., 12, 13, 226, 227 

 Whitehead, T. N., 230, 231 

 Whitney, W. R., 199 

 Wilhelmy, L., 130 

 William of Occam, 55 

 Williamson, A. W., 124 

 Willis, Thomas, 146 

 Wohler, Friedrich, 123, 124, 127, 



129, 155 

 Wolff, Caspar, 150, 153, 172 

 ^Volsey, Thomas, 12 

 Wolters, A. W. P., 50 



Wren, Sir Christopher, 83 

 Writing, origin of, 26, 27, 225, 226 



X-ray tubes, 110 



X-rays, 110, 111, 135 

 diffraction of, 111 

 discovery of, 106, 198 

 emitted by elements, 137 

 nature of, 102, 111 

 producing mutation, 166 



Young, Thomas, 97, 100 



Zeiss Carl, 217 



Zilsel, E., 57, 67, 75, 77 



