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INTENDED FOR THE

INSTRUCTION AND ENTERTAINMENT

OF

YOUNG PEOPLE:

IN WHICH THE

FIRST PRINCIPLES

OF

NATURAL AND EXPERIMENTAL

PHILOSOPHY

ARE FULLY EXPLAINED.

VOL. V. OF OPTICS AND MAGNETISM.

"Conversation, with the habit of explaining the meaning of
"words, and the structure of common domestic implements to
"children, is the sure and effectual method of preparing the
"mind for the acquirement of science."

EDGEWORTH'S PRACTICAL EDUCATION.

By the Rev. J. JOYCE.

NEW EDITION, CORRECTED AND IMPROVED.

LONDON:

PRINTED FOR J. JOHNSON,

No. 72, ST. PAUL'S CHURCHYARD.

EducT 20 218, 09.468(5)

HARVARD COLLEGE LIBRARY
THE VEQUEST OF
THEODORE JEWER EASTWAN

Printed by S. Hamilton, Weybridge.

ADVERTISEMENT.

In presenting to the public

the concluding volumes of the SCIENTIFIC DIALOGUES, the Author cannot but acknowledge, with sentiments of gratitude, the favourable reception which the former parts of the work have experienced. He trusts that the several subjects comprised in these last volumes, will have an equal claim to the candour of those who are engaged in the arduous but honourable employment of education.

It will be seen that it was quite impossible to include in the six volumes the

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