TO Teachers and Parents.
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ELEMENTS OF NATURAL PHILOSOPHY /:
embracing the general principles of Mechanics.
Hydrostatics, Hydraulics, Pneumatics, Acous-
ties, Optics, Electricity, Galvanisrn, Magnetism,
and Astronomy. illustrated by severalhundred
Engravings. By LEONARD .. GALE, NJ. D., Pro
fessor of Geology and Mineralogy IN the Uni


versity OF the City Of New-3ork and Lecturer
on Chemistry and Natural Philosophy. Price
full bound, so cents; 81 50a dozen TO Teachers


The above work Is in the best school
aud sennaEss throughout different parts of the United srr
and IS considered the best book learners
Gale being himself practical Chemist and his
duties as Lecturer requiring him make constant and
ed experiments in all branches OF Natural Philnsophr
emnenri qualified for the task Of editing such work Mos
OF the other publications the popular 5raachsz Of Poso
phy ana Chemistry ara mere compilations made by book
makers hence the frequent failures Of students IL their al
experiments while following the directions conaine
IN these york. No such difficulty ;vili oecu, IL The use
this 17o-k OF Dr.. Gaip.


Orders Ess bs accompanied nv the CASH ass address


70 GREELEY 3IcELRATH, New Yo.k.