vi SPECIAL TOPICS IN THEORETICAL ARITHMETIC

terminate equations of the first degree in two unknowns
(§§ 397-419); the three mechanical devices (§ 467) suggested
by the finger rule of multiplication (§ 463); and the thoro dis-
cussion of several curious properties of numbers (§§ 475-486).
The book contains an index which doesn’t require the reader
to guess whether the references are to pages or to articles.

JosEpH BOWDEN.
PINE GROVE,
CANAAN, CONNECTICUT,
June 28, 1934.