300 THE ELEMENTS OF ECONOMIC GEOLOGY 
Sjogren, H., 141. 
Slichter, C. S., 220, 225, 
Smith, William, 2435, 
Sorby, H. C., 145. 
Speak, S. J., 108. 
Spurr, J. E,, 25, 48, 112, 
Stahl, A., 173. 
Steers, J. A. 244. 
Stelzner, A, W., 76. 
Stevenson, Alan, 240, 
Stewart, Murray, 189, 267 
Stone, R. W., 287. 
Stutzer, 0, 143. 
Strahan, A. W., 271, 
Suess, E., 221. 
Swan, —, 195. 
Symons, G. J., 220. 
WADSWORTH, M. E., 132. 
Wagner, P, A. 68, 119, 162 
Walker, G. W., 250. 
Walker, T. L., 11 5. 
Walther, J., 212. 
Watson, T. L., 118. 
Werner, A. G., 16, 
Weston-Dunn, J. G., 74 
Wheeler, W. H., 248. 
White, D., 281. 
Whitehead, W. L., 112, 
Whitelaw, H, S., 44. 
Whitman, A, R, 112, 
Williams, G. F., 164. 
Wilson, E. B., 54. 
Winslow, A, 107. 
Woodward, H. P., 40. 
TAFF, J. A, 287, 
Tegengren, F. R., 123, 126. 
Thompson, Beeby, 278, 290, 293, 
Tikonowitch, M. N, 67. 
Tolman, C, F, 115, 
Tornebohm, A. E., 187. 
Trask, P. D,, 93. 
Turner, H, H., 251, 
Tyrrell, G. W., 16, 24, 191. 
Tyrrell, J. B., 63, 112, 
Young, James, 295, 
Young, R. B., 62, 63. 
ZrALLEY, A. E. V., 150. 
Zeretelli, D., 150, 
Zurcher, O., 180.