8 
(and the latter Sovereign, in addition, a considerable 
sum in specie) ; together with the most flattering letters, 
which the Author must attribute less to a sense of his 
merits in that part of his plan which he has already 
executed, than to a desire of encouraging him to per- 
severe in his purpose which he has declared, and is 
now prosecuting, of illustrating other branches of Na- 
tural History. 
