WILLIAM SMITH : HIS MAPS AND MEMOIRS 121 
Professor Judd* admirably summarises tlie main defects of this 
map: — "The representation of the Tertiaries was very inadequate, 
no indication of the Crags being given, the Isle of Wight Tertiaries, 
the Bagshot Beds of Southern England, and the Boulder-clays of East 
Anglia being all confounded together, and the relation of these to the 
London Clay being left obscure. The Wealden Area was altogether 
unsatisfactorily treated, the argillaceous strata being coloured as 
Oaktree Clay " and the arenaceous as ironsand (Lower Greensand, 
etc.). Lastly, the Jurassic estuarine strata of North Yorkshire were 
confounded with the " carstone and ironstone " of the South-East of 
England. On the other hand, it is interesting to note that Smith 
had already learned at this early date the existence of strata lying be- 
tween the Old Red Sandstone and the slaty rocks of Wales and Cumber- 
land. These have a tablet assigned to them in his legend with the 
description, " various alternations of hardstone, limestone and slate," 
though the information he possessed was not sufficient to enable him 
to extend proper colours for them to the map. This is probably the 
earliest notice of the strata afterwards made so famous by the re- 
searches of Murchison and his coadjutors." 
The copy described above is evidently one of those " Mounted on 
canvas, fitted in a case for Travelling," which was sold at £7 Os. Od. 
Recently I have been fortunate enough to obtain another copy of 
this map, which gives us some additional information. It is in a 
wonderfully clean state, the colours being quite fresh. With it is a 
copy of the Memoir, in the original binding ; and a copy of the original 
prospectus of the map, which I had not previously seen. This last is 
a small quarto four-page sheet, on the front of which is : — 
* loo. cit., p. 101. 
