TO THE 
RIGHT REV. EDWARD LORD BISHOP OF LLANDAFF, 
AND TO 
THE REV. R. WHATELY, 
PRINCIPAL OF ALBAN HALL, 
FROM WHOSE VALUABLE DISQUISITIONS 
ON THE SUBJECT OF ANALOGY 
I HAVE DERIVED MUCH INSTRUCTION ; 
AND TO MY BELOVED BROTHER, 
P. B. DUNCAN, 
(MY SUCCESSOR AS CURATOR OF THE ASHMOLEAN MUSEUM, 
AND MY CONSTANT SUSTAINING AND CHEERING COADJUTOR IN ALL 
LABOURS OF JOY OR OF SORROW) 
THIS SPECULATIVE ESSAY 
IS HUMBLY DEDICATED, 
IN THE HOPE THAT THEY MAY NOT CONTEMN 
~THE OFFERING, HOWEVER IMPERFECT, OF 
J.S. DUNCAN. 
WESTFIELD LonGE, 
May, 1831. 
