Chapter XIX: Part II: , containing the Lower Palæozoic Mollusca, is in the press

THOUGHTS ON A PEBBLE; or, a First Lesson in Geology. By Dr.
MANTELL, F.R.S. _Eighth Edition_, considerably enlarged. With
four coloured plates, twenty-seven woodcuts, and a Portrait of
the Author. Square 12mo. 5_s._

"I have just procured a little work for my young pupils, a most
delightful introduction, entitled 'Thoughts on a Pebble, or a
First Lesson in Geology,' by Dr. Mantell, and I must request
you to read it; for although it does not consist of more than
thirty pages [increased in the present edition to upwards of a
hundred] it will expand to your view a new world that will
astonish and delight you."--_Philosophy in Sport._

MISCELLANEOUS.

ELEMENTARY PHYSICS; an Introduction to the Study of Natural
Philosophy. By ROBERT HUNT, Professor of Mechanical Science at
the Government School of Mines, Author of 'Poetry of Science,'
'Researches on Light,' and 'Handbook to the Great Exhibition.'
Illustrated with a coloured frontispiece, and 217 vignettes and
wood engravings. Fcap. 8vo, cloth. 10_s._ 6_d._

CONTENTS.