‘cl 
Mr: Farey’s Reply to Mr. Bakewell’s Letter. 169 
“Ieulted from collating the separate Notes, made in four or. 
‘ive subseqtent journeys, some by the other Roads, and for 
‘correctly describing the positions of the strata and leading 
geological features of the district (without pretending that 
it is accurate in all respects); although previous to this jour- 
ney, had been given to understand, that the district was 
differently constructed in every respect. Mr. Smith not 
_ shaving then examined much of the two most sonth-eastéra 
counties of England, but trusting ‘too much to the infor- 
mation of others, had concluded, and delineated on his 
Map (a copy of part of which I possess, made in 1801), the 
North and South Downs of chalk, extending from Dover 
to Guilford and Farnham, and thence near to Petersfield and 
Lewes to Beachy-Head, as pars of an upper rock of chalk, 
situated above the London Clay; but my “ stage-coach 
observations,” when a mere tyro in Mineral Surveying, 
“were sufficient to show at once, the true structure of this 
curious part of our island. 
In my Paper, so unhandsomelystreated by certain leading 
persons in the Geological Society (p. 55 Note), IT was de- 
Sirous of explaining as fully and clearly as possible, the 
principles and practice of this important art, of the use and 
value of which, I desire no better test, than the oppor- 
tunity,’ to make a sufficient number of ‘* stage-coach ” 
journeys in suitable weather, across a district (anywhere 
Situated) either before or after an elaborate Mineral or 
Geological Survey of the same has been made by others, 
in order to show, whether the true and useful Geological 
features of a country, can by this means be obtained, or 
not. 
We will then, if the parties please, descend to apply 
the same principles, (and quickly too, by adequate assist- 
ance) to the tracing of every characteristic or useful stra= 
tum, and to the filling up, of a Mineral Map of the surface, 
however large, notwithstanding that Mr. B. says positively, 
at p. 125, that ** this can only be app ted to small districts 
or estates,’’ (see also p. 255 Geo.) —The other two ** modes 
of forming a Geological Map,” meutioned by Mr. B. I 
will gladly leave in his quiet possession, and that of his 
geognostic associates. ad 
Mr. B. says, p. 124, that I persist ** in objecting to the 
identity of the limestone of Craven in Yorkshire, with that 
of the High Peak in Derbyshire;” forgetting, that more 
than 15 months ago (vol, xxxix. p. 427) [ stated my 
grounds of dissent from his opinion, and requested that he 
would inform us, whether the succession upwards, from 
what 
