24) SUPPLEMENTARY INDEX TO VOL, II. 
in his own large and unparalleled Map of England and 
Wales, but also in all the largest county maps, local 
maps of canals, roads, mining districts, &c. &c. which 
either his own large collection contains, or to which he 
can have access, through the kindness of the friends of 
science: unfortunately, however, for me, this great Index 
io Localities, although all the names from printed maps 
were collected out, (and ascertained by bearings and 
distances,) and it is now rapidly proceeding towards its 
final revision and completion, it has not been in a state 
for me to consult it, as otherwise the kindness and libe- 
rality of Mr. A. would have permitted, prior to its 
publication, which now will soon take place, with the 
addition of the population, and a blank column for future 
eorrections and additions, and to enable this volume to 
be made by scientific, curious, or travelling persons, into 
an Universal Index to Localities in South Britain! 
In my Stratigraphical Index to Vol. I., I took the 
liberty of placing 33 notes of interrogation (?, see Phil. 
Mag. Vol. XLVI. p. 212, note,) after as many species 
of shells, which had (by the places mentioned in that 
volume) been referred to other strata, besides that parti- 
cular stratum, in which I concluded, from your descrip- 
tions, that the specimen drawn and actually described, 
had been found entombed. I could not hope, at the 
time of making these first stratigraphical arrangements 
of the shells and localities which you had described and 
mentioned, that I could escape errors: I regret, however, 
to find, now that further information is afforded, that 
they are so numerous as I find them to be; and more 
so, that the means do not at present exist of correcting 
many errors, which doubtless yet must remain, in that 
and the present Supplementary Index, after all that-I 
can at present do; or, until your kind and generous 
friends and contributors send you up, either as gifts or 
