ry of the Sun.

By Sir ROBERT S. BALL, F.R.S., author of "An Atlas of Astronomy," "The
Cause of an Ice Age," etc. 8vo. Cloth, $5.00.

"Sir Robert Ball has the happy gift of making abstruse problems
intelligible to the 'wayfaring man' by the aid of simple language
and a few diagrams. Science moves so fast that there was room for a
volume which should enlighten the general leader on the present
state of knowledge about solar phenomena, and that place the
present treatise admirably fills."--_London Chronicle._

An Atlas of Astronomy.

By Sir ROBERT S. BALL, F.R.S., Professor of Astronomy and Geometry at
the University of Cambridge; author of "Starland," "The Cause of an Ice
Age," etc. With 72 Plates, Explanatory Text, and Complete Index. Small
4to. Cloth, $4.00.

"The high reputation of Sir Robert Ball as a writer on astronomy at
once popular and scientific is in itself more than sufficient
recommendation of his newly published 'Atlas of Astronomy.' ... The
introduction is written with Sir Robert Ball's well-known lucidity
and simplicity of exposition, and altogether the Atlas is admirably
adapted to meet the needs and smooth the difficulties of young and
inexperienced students of astronomy, as well as materially to
assist the researches of those that are more advanced."--_London
Times._

Studies in Spectrum Analysis.

By J. NORMAN LOCKYER, F.R.S., Correspondent of the Institute of France,
etc. With 60 Illustrations. 12mo. Cloth, $2.50.

"The study of spectrum analysis is one fraught with a peculiar
fascination, and some of the author's experiments are exceedingly
picturesque in their results. They are so lucidly described, too,
that the reader keeps on from page to page, never flagging in
interest in the matter before him, nor putting down the book until
the last page is reached."--_New York Evening Express._

The Story of the Stars.

By G.F. CHAMBERS, F.R.A.S., author of "Handbook of Descriptive and
Practical Astronomy," etc. With 24 Illustrations. (Library of Useful
Stories.) 16mo. Cloth, 40 cents.

"One can here get a clear conception of the relative condition of
the stars and constellations, and of the existent universe so far
as it is disclosed to view. The author presents his wonderful and
at times bewildering facts in a bright and cheery spirit that makes
the book dou