To Teacners and Parents.
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ELEMENTS OF NATURAL PHILOSOPHY,
(; embracing the general principles of Mechanics,
Hydrosiatics. Hydraulics, Pneumatics, Acous-
tcs, Optics, Ele. ricity, Galyanism, Magnetism,
and Astronomy. illustrated by several hundred
Engravnss BY LKoNARp d. GALE, M. D., Pro.
lessor of Geology and Mineralogy In the Uni
yessity of the City of New-York, and LECTURER
on Chemistry and Natural Philosophy, Prce,
iuilbound, 80 cents; 81 80 dozento Teachers.
seovc is.rtensyey the
OF the United States
ca tie best book sntant


ues him make constant and repeat


n all branches of Natural Philosophy, wa,
esnty qualified for the task ofediting sucha work Most
other publications the popular branches OF Phoso-
sno Chemistry mere compilstous made by BOOK


hence the frequent failures cf students in their at


while the contained
H. hess works such difficulty will occur IN the use Of


ORDERS must be accompanejbv the eash andaddre,sed


10 GREELEY < McELRATH. New York.