29, 30, 35, 41, 49, 63, 123, 131, 142.

Ditch, Bridging the, 83, 204.

Divisors of Numbers, To Find, 170.

Doctor of Physic, The Puzzle of the, 42, 174.

Donjon Keep Window, The, 62, 188.

Dorcas Society, The, 151, 245.

Dormitory Puzzle, The, 70.

Dungeon, The Death's-head, 60.

Dungeons, The Nine, 35.

Dyer's Puzzle, The, 50, 180.

Edward, Portrait of King, 46.

Eggs, Selling the, 135.

Eleven Pennies, The, 88, 206.

Errand Boys, The Two, 147, 242.

Escape of King's Jester, The Strange, 78, 201.

Executioner, The, 78.

Fallacy of Square's Diagonal, 52.

Farmer's Oxen, The, 157, 248.

Fermat, P. de, 174.

Fish-pond, The Riddle of the, 69, 194.

Flag, Making a, 123, 223.

Fleurs-de-Lys, Sixty-four, 50.

Flour, The Nine Sacks of, 26.

Fly, The Spider and the, 121, 221.

Footprints Puzzles, 101, 105.

Four Princes, The, 153, 246.

Foxes and Geese, 140, 239.

Franklin's Puzzle, The, 44, 176.

Friar and Sompnour's Dispute, 51, 180.

Friar's Puzzle, The, 46, 177.

Frogs and Tumblers, The, 113, 216.

Frogs who would a-wooing go, 116, 219.

Frogs' Ring, The Riddle of the, 76, 199.

Games, Puzzle, 118, 125, 156, 157.

Gardens, The Royal, 82, 203.

Geese, The Christmas, 88, 206.

Geometrical Problems, 52, 62, 67, 121, 131, 144, 146.

Grangemoor Mystery, The, 158, 249.

Group Problems, Combination and. See Combination and Group Problems.

Haberdasher's Puzzle, The, 49, 178.

Hogs, Catching the, 124, 223.

Hoppe, Oscar, 198.

Host's Puzzle, The, 28, 166.

Isabel's Casket, Lady, 67, 191.

Jaenisch, 237.

Japanese Ladies and the Carpet, 131, 231.

Jester, Strange Escape of the King's, 78, 201.

Kayles, The Game of, 118, 220.

Kennels, The Nine, 39.

King's Jester, Strange Escape of the, 78, 201.

Knight's Puzzle, The, 26, 165.

Lady Isabel's Casket, 67, 191.

_L'Arithmetique Amusante_, 198.

Legendre, 175.

Letter Puzzles, 16.

Lock, The Secret, 80, 202.

Locomotive and Speed Puzzle, 147.

Longbow and the Bears, Capt., 132, 233.

Lucas, Edouard, 175, 198, 242.

M'Elroy, C. W., 179.

_Magdalen_, Chart of the, 41.

Magic Square, A Reversible, 149, 243.

Magic Square Problems, 21, 29, 44, 111, 112, 128, 149.

Manciple's Puzzle, The, 56, 183.

Man of Law's Puzzle, The, 34, 170.

Market Woman, The Ecc