Seientifie Publications. 
GENERAL PHYSIOLOGY OF MUSCLES AND NERVES. By Dr. 1. 
RosentTHAL, Professor of Physiology at the University of Erlangen. With 
seventy-five Woodcuts. (‘International Scientific Series.) 12mo, cloth, 
$1.50. 
“The attempt at a connected acconnt of the general physiology of muscles 
nd nerves is, as far as I know, the first of its kind. The general data for this 
branch of science have been gained ouly within the past thirty years."—Hatract 
from Preface. 
SIGHT: An Exposition of the Principles of Monocular and Binocular Vision. 
By Josern Le Conrz, LL.D., author of “ Elements of Geology’’; ‘* Re- 
ligion and Science”; and Professor of Geology and Natural History in the 
University of California. With numerous Illustrations. 12mo, cloth, $1.50. 
“Tt is pleasant to find an American book which can rank with the very best 
of foreign works on this subject. Professor Le Conte bas long been known as 
an original investigator in this department; all that he gives us is treated with 
a master-hand.”"—Zhe Nation. 
ANIMAL LIFE, as affected by the Natural Conditious of Existence. By 
Karu Semper, Professor of the University of Wirzburg. With 2 Maps 
and 106 Woodcuts, and Index. 12mo, cloth, $2.00. 
‘““This is in many respects one of the most interesting contributions to 
zodlogical literature which has appeared fur some time.” —Wature. 
THE ATOMIC THEORY. By Av. Wurtz, Membre de I’Institut; Doyen 
Honoraire de la Faculté de Médecine; Professeur A la Faculté des Sciences 
de Paris. Trauslated by E. CLemnspaw, M.A., F.C.S., F.1.C., Assist- 
ant Master at Sherborne School. 12mo, cloth, $1.50. 
“ There was need for a book like this, which discusses the atomic theory both 
in its historic evolution and in its present form. And perhaps no man of this 
age could have been selected so able to perform the task in a masterly way a8 
the illustrious French chemist, Adolph Wurtz. It is impossible to convey to the 
reader, in a notice like this, any adequate idea of the scope, lucid instructivenese. 
and scientific interest of Professor Wurtz's book. ‘Fhe modern problems o: 
chemistry, which are commonly so obscure from imperfect exponen are here 
made wonderfully clear and attractive.”"— Zhe Popular Science Monthly. 
THE CRAYFISH. An Introduction to the Study of Zodlogy. By Professor 
T. H. Huxtey, F.R.S. With 82 Illustrations, 12mo, cloth, $1.75. 
“ Whoever will follow these pages, crayfish in hand, and will try to verify for 
himself the statements which they contain, will find himself brought face to face, 
with a abe great zodlogical questions which excite so lively an interest at the 
(present day. 
“The reader of this valuable monograph will lay it down with a feeling of 
wonder at the amount and variety of matter which has been got out of so seem. 
irgly slight and unpretending a subject.""—Saturday Review. 
D. APPLETON & CO., Publishers, 
1, 8, & 5 Bony Street, New Yoru. 
