xviii PREFACE. 
To Auexanprr MacLmay, Esq. they are under particular obli- 
gations for the warm interest he has all along taken in the work, 
the judicious advice he has on many occasions given, the free ac- 
cess in which he has indulged the authors to his unrivalled cabinet 
and well-stored library, and the numerous other attentions and 
accommodations by which he has materially assisted them in its 
progress. . 
To the other friends who have kindly aided them in this under- 
taking in any way, they beg here to offer their best thanks, 
