LONDON:
JOHN VAN VOORST, PATERNOSTER ROW.
MDCCCLI.
PRINTED BY RICHARD TAYLOR,
RED LION COURT, FLEET STREET.
PREFACE.
The following pages represent a Course of Six Lectures delivered at the Mechanics’ Institution, Liverpool, in the month of March of the present year; the matter being now laid before the public in a somewhat fuller and more systematic form than was compatible with the original delivery.