h-discussed
article contributed by Dr. Wallace to the _Fortnightly Review_ for March
1903, and presents the whole subject in a more complete and systematic
manner, besides containing many new and forcible arguments which a more
careful consideration of the whole problem has suggested.

In the course of the work the various astronomical and other criticisms
of the article are considered and replied to.

A NEW THEORY OF GRAVITATION.

AETHER AND GRAVITATION. By W. G. HOOPER, F.S.S. With Diagrams. Demy 8vo,
_12s. 6d. net_.

This work seeks to offer an acceptable solution of the greatest
scientific problem that has puzzled scientists for the past 200 years.
Ever since the discovery of universal gravitation by Sir Isaac Newton,
the question has arisen, over and over again, as to what is the physical
cause of the attraction of gravitation. Is it due, as Newton himself
suggested, to the properties and qualities of the universal aether, or
is it due to some still unknown and undiscovered medium?

By the theory propounded in this work, the author has for the first time
brought aetherial physics into harmony with all observation and
experiments; so that the inertia, the density, and the elasticity of the
aether are brought into harmony with all experience by philosophical
reasoning based on Newton's Rules of Philosophy.

LIFE AND TOPOGRAPHY OF DICKENS.

THE REAL DICKENS LAND. With an outline of Charles Dickens's life. By H.
SNOWDEN WARD and CATHARINE WARD, authors of "Shakespeare's Town and
Times." With a Steel Plate Portrait of Dickens, Three Photogravures, and
nearly 300 full-page and other Illustrations. Crown 4to, _10s. 6d. net_.

Charles Dickens's understanding of the human character is apparent to
every good reader of his works; but his intimate knowledge of the
"character" of places, and of the important effect of place upon the
human being, is not so apparent, because the reader has not the
necessary knowledge of the places upon which to base an estimate.

In "The Real Dickens Land" the authors have attempted to supply this
necessary knowledge, not only by literary identification, but by
presenting one of the fullest collections of photographic views thus
identified ever got together.

LONDON: CHAPMAN & HALL, LTD.

CARLYLE'S LIFE AND TOPOGRAPHY.

THE CARLYLE COUNTRY. With a study of Carlyle's life. By J. M. SLOAN.