ON

CERTAIN TESTS

OF A

THRIVING POPULATION.

FOUR LECTURES

DELIVERED BEFORE

THE UNIVERSITY OF OXFORD,

IN LENT TERM, 1845.

BY

TRAVERS TWISS, D.C.L. F.R. S.

PROFESSOR OF POLITICAL ECONOMY, AND FELLOW OF UNIVERSITY
COLLEGE, OXFORD.

LONDON:

LONGMAN, BROWN, GREEN, AND LONGMANS,

PATERNOSTER-ROW.

45.

6.

26.

LONDON:

Printed by A. SPOTTISWOODE,

New-Street-Square.