240 
A SUPPLEMENTARY INDEX TO YOL. II. 
Arranging the Shells described therein according 
to the several Strata in which they were found 
imbedded , from the newest towards the oldest 
in the British Series. 
Instead of any prefatory remarks of iny own, I will 
insert the following Letter, received from my kind friend 
Mr. Farey, viz. 
Sir, j beg to apologize to your numerous and 
highly respectable Correspondents and Readers, for my 
delay in furnishing the Stratigraphical Index, sent here- 
with. I had foreseen, since the perusal of my friend Mr* 
Smith’s “ Stratigraphical System,” Part I. and the three 
first numbers of his u Strata Identified,” that a great 
deal of care and pains were necessary, (for which I could 
not until lately spare the time,) in collating these works 
of his, with the whole of the stratigraphical information 
contained in all your published numbers of u Mineral 
Conchology,” before Indexes, at all satisfactory, could 
be made out, for you and Mr. Tilloch, such as I had 
imperfectly done at the conclusion of your first volume, 
in September, 1815. 
I was in hopes, that by some delay, my labour in 
hunting through maps for the situations of a considerable 
portion of the places mentioned in your’s and Mr. Smith’s 
works, might ere this have been greatly shortened, by a 
reference to the manuscript Index which my valued 
friend, the able and indefatigable Mr. Arrowsmith , of 
Soho Square, has for near two years been preparing ; 
and which is intended to contain every Name , of towns, 
villages, farms and cottages, mills, mines, collieries and 
quarries, rivers } streams, and water-falls, bays, head- 
lands, cliffs, and light-houses, mountains, hills and val- 
leys, parks, forests and woods, &c. &c. ; together with 
the district names, &c. which are to be found, not only 
