TO Teachers aud Parents.
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ELEMENTS OF NATURAL PHILOSOPHY,
embracing the general principles of Mechanics,
Hydrosta,ics, Hydraulics, Pneumatlcs, Acous-
tics Optics, Electricity, Galvanism, Magnetism,
and Astronomy Illustrated by several hundred
Engravlngs. BY LEONARD D GALE, M D., Pro.
fessor of Geology and Mineralogy IN the Uni
versity OF the City of New-Y ork, and Lecturer
on Chemistry and Natural Philosophy. Price,
full bound, 50 cents 81 5Oa dozen to Teachers.
The above work extensively the bes, schools
and senariss throughout different parts he United States
and considered the best book Dr.
Gale being himself practical Chemist and his professional
duties as Lecturer requiring him make repeat
90 experiments IN all branches Of Natural Philosophy
eminenty qualified for the task OF editing such work Most
o the other publications the popular branches OF Phoso
phy and Chemistry compilations made By book
MAKERS hence the frequent failures Of students in their at
empts experiments while following the directions contained
III these works No such difficulty will in the use OF
TINS work Of Dr. Gale


o. Orders be accompanied bv the cash. and addressed


10 GREELEY McELRATR, New York.