THINKING IT OUT. BY A. WILLIAMS.

One of Mr. Williams's ever-popular volumes. A new volume in the "How It Works" series. The author gives the why and wherefore of many everyday problems which captivate and puzzle the young mind.

Fully illustrated, 6s. net.

CANTERBURY PUZZLES.
BY H. E. DUDENEY.

"The most ingenious brain in England," says a London reviewer. Mr. Dudeney's "Amusements in Mathematics" must have whiled away many a weary hour in the Flanders trenches. This forthcoming volume will be an equally fascinating companion.

Many illustrations. Cloth, 3s. 6d. net.

SCIENTIFIC AMUSEMENTS.
BY PROF. C. G. KNOTT.

Translated from the French of "Tom Tit," and adapted by Professor C. G. KNOTT. A unique collection of interesting experiments designed to amuse young people and to initiate them into the mysteries of physical laws.

Cloth, profusely illustrated, 6s. net.