TO Teachers and Parents.
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ELEMENTS OF NATURAL PHILOSOPHY,
embracing the general principles OF Mechanics,
HydroslsIics, Hydraulics Pnermatics, Acons-
tics, Optics, Electricity, Gaivaaisn, Magnetism,
and Astronomy. illustrated by seyeralhundreG
Engraylngs. Ey LEONARD D. GALE, NJ. D., Pro.
fessor of Geology and MineraIosy IN the Uni
versily of the City Of New-iork, and Lecturer
on Chemistry aud Natural Philosophy Price,
full bound, 81 cents; 81 5Oa dozen TO Teachers.
Tn. above wo. srNtensIyei iatToduccn -bst school.
aud ,erliuafies ersnt parts the United
aud IS considered best book FOR private Dr.
(ia- being himself PRACTICAL Chemist aud has professional
duties Lecturer ElnItin him TO make constant and la
-d experiments In Il. branches OF Natural Philosophy.
emn-ntly qualified for the task OF editing such work Most
OF the publications The popular branches OF Phiios
pv and Chemistry computations .iI.- by book.
makers hence the frequent isiinTes OF students in their
temptsat w!'ie IN directions
;Hs wo7k OF Dr.. G4l-.


Orr:s nans, De accomDaniedbv the cash ndaddcssec


10 GREELEY * NcEJRATH, .lzw York.