WILLIAM SMITH ! HIS MAPS AND MEMOIRS 173 
The village of Silpho is in the centre of the map ; in the top right 
hand corner (north) is Harwood Dale ; Lang dale Rig is in the top left- 
hand corner ; and the map includes High Dales, Wisper Dales, Low 
Dales, BarnscHffe Woods, Broxa and Broxa Moor, Silpho and Silpho 
Moor, Mount Misery, Hackness, Suffield, and Combouts. Towards the 
bottom of the map are Everley, Scalby Nabs, Scalby Drain, and Mow- 
thorpe, and finally Forge Valley. The Biver Derwent is shown at the 
left. Throughout, the various beds are numbered, so that the colouring 
of the map would not be a difficult matter. 
I give a reproduction of this valuable document, taken from the 
imcoloured lithograph. (Plate XVII). 
To show the accuracy of Smith's work, I give on Plate XIX, a 
reduced reproduction of our copy of Smith's Hackness map, which 
we have coloured from the faded copy in the possession of the 
Scarborough Society ; and on the adjoining Plate (XVIII,), a repro- 
duction of the Geological Survey Map, V\ as surveyed by the late 
C. Fox-Strangways in 1878. 
Two other copies of the Hackness map, uncoloured, have since 
been traced at Scarborough, which have been kindly given to 
me by Mr. Sydney P. TumbuU, J.P. 
In his " Jurassic Rocks of Yorkshire " Vol. 1. 1892, p. 513, Fox- 
Strangways states that the " old drawing," the original of the lithograph 
by Day of the Hackness Map, " is still in the possession of the Turnbull 
family." It was shown at the " Special loan collection of scientific 
apparatus " at South Kensington in 1877, and was described in the 
Catalogue (3rd. ed. p. 823) as William Smith's original Geological Map 
of Hackness Hill, Yorkshire, being one of the earliest geological maps 
ever constructed on a large scale .... The maps ... of the outlying 
mass of the Middle Oolite at Hackness, exhibit in a striking manner the 
great knowledge of the author, and the able manner in which he traced 
and mapped their geological structure, and pointed out its bearing 
on the agriculture of the District. The Geological Survey Map of the 
same area [hung by its side in the collection] .... shows that WiUiam 
Smith was well acquainted with the general details of this unique and 
somewhat obscure group of rocks. 
The late C. Fox-Strangways prepared* the following 
* loc. cit. page 514. 
