To Teachers and Parents.
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ELEMENTS OF NATURAL PHILOSOPHY,
embracing The general principles OF Mechanics


Hydroslalics, Hydraulics, PneumatcS, Acous-
ucs, Optics, Electricity, GaIvansm, Magnetism,
and Astronomy. Illustrated by several hundred


Engravings. BY LEONARD d. GALE, NJ. D., Pro-
rcssor of Geology and Mlneralogy III the Uni
verslty OF the City of New-York, and Lecturer
on Chemistry and Natural Philosophy. Prlce,
full bound 81 cents 81 90 dozen 10 Teachers
The above work is-xtrsye the best schools
ud semnaIes throughout different the United States,
md is consdrr. the best book nI pr Dr.
Gale bin. himself PRACTICAL Chemist and his professional
dues Lecturer requiring him 10 make constant d re-'
rrutS all branches of Natural Philosophy, was
.nlney qualified for task of editing such work Most
M the other publications the porul, branches OF Phoso-
uhy aud Chemistry compilations made by book
makers hence the frequent failures OF stndenS III their at,
trnrs while following the directions contained
III these No such difficulty Will occur IN the use OF
this ofk Of Dr. Gale. ,


- Orders must be icconpaned bv the cash. aud addressed


to GREELEY McELRATH, New York