TO

HIS GRACE

, THE

DUKE OF NORTHUMBERLAND,

F. R. and A. S. &c. &c.

ONE OF THE VICE-PRESIDENTS OF THESOCIETY OF ARTS,

AND

PATRON

OF THE

SOCIETY ESTABLISHED AT SUNDERLAND FORPREVENTING ACCIDENTS IN COAL MINES,

THIS BOOK

is,

WITH THE GREATEST RESPECT,

MOST HUMBLY AND GRATEFULLYDEDICATED BY

the author.

/