|Chapter XX||Contents etc.|
BY THE SAME AUTHOR . . .
THE FOURTH DIMENSION.
Illustrated. SECOND EDITION, 4s. 6d.
"A treatise of moderate size, clear in method and free from
"A very solid piece of reasoning in the domain of higher mathematics." —Glasgow Herald.
Models to accompany The Fourth Dimension:—
A NEW ERA OF THOUGHT.
SECOND EDITION, 4s. 6d.
"To say the least of it, the book is a powerful mental gymnastic.
In Two Series. EACH 6s.
SERIES I.—What is the Fourth Dimension—The Persian King or
SERIES II.—Education of the Imagination—Many Dimensions—