366 



INDEX 



Taylor, Ch. 345. 

 Taylor, H. M. 110, 259. 

 Tennis-ball, Cut on, 103-105. 

 Tent Flap, String Figure, 325-326. 

 Tesselation, 64-67, 255-256. 

 Texeira, F. G. 337. 

 Theory of Numbers, 36-43. 

 Thibaut, G. on Baudhavana, 351. 

 Thompson, T. P. on Parallels, 307. 

 Thomson, J. J. 105. 

 Threading Needle, String Trick, 333- 



334. 

 Three-in-a-row, 62-64. 

 Three-pile Problem, 240-245. 

 Three-Things Problem, 12-23. 

 Tom Tit, 332. 

 Tower of Hanoi, 228-229. 

 Trastevere, Labyrinth at, 186. 

 Trebly-Magic Squares, 158. 

 Trees, Geometrical, 188. 

 Treize, Game of, 245-246. 

 Tremaux on Mazes, 183. 

 Tricks with numbers, 3-34. 

 Trisection of Angle, 344-346. 

 Tritheim, J. 292. 

 Trollope, E. on Mazes, 184. 

 Troy-towns, 186. 

 Turtoh, W. H. 49,121. 

 Two-Digit Process, 285. 



Unioursal Problems, chap. ix. 



Van Ceulen on jt, 354, 355. 



Vandermonde, 80, 122, 127. 



Van Etten, H. 11. 



Varignon, P. on Parallels, 322. 



Vase Problem, 18. 



Vega on w, 304. 



Victorinus, 54. 



Vieta, F. 343, 355. 



Violle, B., Magic Squares, 139. 



Virgil, 184. 



Volpicelli, P. on Knight's Path, 122. 



Von Bilguer on Chess Pieces, 112. 



Von Helmholtz, H. F. L. 97. 



Voting, Question on, 33. 



Waistcoat Trick, 336. 



Walecki on Kirkman's Prob., 218. 



Walker, G. T. 28. 



Wallis, J. 229, 232, 265, 355. 



Wantzell, P. L. 284. 



Warnsdorff, Knight's Path, 128. 



Watch Problem, 14-15. 



Watches, 96. 



Watersheds and Watercourses, 60-61. 



Waves, Superposition of, 108. 



Weights Problem, The, 34-36. 



Western, A. E. on Binary Powers, 40. 



Whately, E. 269. 



Wheatstone, C. 311, 316, 317. 



Whist, Number of Hands at, 33. 



Wiedemann, A. on Lake Moeris, 184. 



Wieferich, A. 42 



Wilkins, J. 292, 300, 307, 309. 



William III of England, 186. 



Willis on Hauksbee's Law, 101. 



Window Reader, 260-262. 



Wing, Labyrinth at, 186. 



Work, 89-93. 



Wostrowitz, E. B. von, 292. 



Yam Thief, String Figure, 328-330. 



Zach, F. X. von on jr, 357. 

 Zamebone, V. 279. 

 Zeno on Motion, 84-85. 





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