e.

CRITICAL NOTICES.

"The work has the merit of conveying much useful scientific information
in a popular manner."--_Phila. North. American_.

"Thoroughly admirable, and as an introduction to this science for the
general reader, leaves hardly anything to be desired."--_N.Y. Evening
Post_.

"Treats in a charming, but scientific and exhaustive manner, the
wonderful subject of optics."--_Cleveland Leader_.

"All the marvels of light and of optical illusions are made
clear."--_N.Y. Observer_.

=Thunder and Lightning.=

THUNDER AND LIGHTNING. By W. DE FONVIELLE.

Illustrated with 39 Engravings on wood, nearly all full-page. One
volume. 12mo $1 50

_For specimen illustrations see page 14._

_Thunder and Lightning_, as its title indicates, deals with the most
startling phenomena of nature. The writings of the author, M. De
Fonvielle, have attracted very general attention in France, as well on
account of the happy manner in which he calls his readers' attention to
certain facts heretofore treated in scientific works only, as because of
the statement of others often observed and spoken of, over which he
appears to throw quite a new light. The different kinds of
lightning--forked, globular, and sheet lightning--are described;
numerous instances of the effects produced by this wonderful agency are
very graphically narrated; and thirty-nine engravings, nearly all
full-page, illustrate the text most effectively. The volume is certain
to excite popular interest, and to call the attention of persons
unaccustomed to observe to some of the wonderful phenomena which
surround us in this world.

CRITICAL NOTICES.

"In the book before us the dryness of detail is avoided. The author has
given us all the scientific information necessary, and yet so happily
united interest with instruction that no person who has the smallest
particle of curiosity to investigate the subject treated of can fail to
be interested in it."--_N.Y. Herald_.

"Any boy or girl who wants to read strange stories and see curious
pictures of the doings of electricity had better get these books."--_Our
Young Folks_.

"A volume which cannot fail to attract attention and awaken interest in
persons who have not been accustomed to give the subject any
thought."--_Daily Register_ (_New Haven_).

=Heat.=

THE WONDERS OF HEAT. By ACHILLE CAZIN.

With 90 illustrations, many of them full-page, and a colored
frontispiece. One volume, 12mo $1 50

_For s