To Teachers and Parents.
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=
ELEMENTS OF NATURAL PHILOSOPHY,
embracing the general principles of Mechanics,
Hvdros,aticS, Hydraulics, Pneurnatics, Acous-
ties, Optics, Electricity, GalvanisIa, Magnetism.
and Astronomy. Illustrated by several hundred c
Engravlngs. BY LEONARD D. GALE. NJ. D., Pro-
frs<o. OF Geology and Mineralogy IN the Uni
yersity of the City Of New-York, and Lecture!
on Chemistry and Natural Philosophy. Price,
full bound, 80 cents; 81 5oa dozen 10 Teachers
The aboy. work extensively bes, school,
aud senin.ris o. the United States
4ad considered the bes; beck for learners Dr.
Gale being himselfa practical Chemist. sad his
da;ie Lecturer r-arng him 70 make constant and
81 experiments 81. branches of Natural Philosophy
e;E-:ly Qn.leG FOR the task Of editing such work Most
OF the Other the popular 6sEches OF Pho,o
ph; and Chemistry cnmpilatop, made by book
makers: hence the frequent Of students IN ther
while following the directions
III th-se works. No Suct dhcul;y will in the
:hts " ok o DR.. Gale.


Orders bv the casl. and addressed


20 GREELEY McELRATH. New York