LONDON:

E. NEWMAN, PRINTER, 9, DEVONSHIRE STREET, BISHOPSGATE.

TO

WILLIAM SPENCE, ESQ., F.R.S., F. L. S.,

JOINT AUTHOR OF THE 'INTRODUCTION TO ENTOMOLOGY,'

ETC., ETC.,

AS A SMALL TRIBUTE OF GRATITUDE

FOR HIS LABOURS

IN THE CAUSE OF NATURAL-HISTORY SCIENCE,

AND OF ADMIRATION FOR HIS PRIVATE CHARACTER,

THIS ATTEMPT TO ENLARGE

THE SPHERE OF MENTAL OCCUPATION FOR THE MANY

IS RESPECTFULLY DEDICATED

BY

THE AUTHOR.