G85 
dius's campaign in Brigantia ; and that the first archaeolo 
gian of the present day has left on record his belief, which 
is borne out by history, that Camulodunum was situate in 
South Yorkshire, near Don-castra, or Dun-castra, within a few 
miles of this very camp I have brought face to face with 
the light of the nineteenth century. I have told how, 
within a few miles where now we are, and not far from this 
ancient camp, there are not a few habitations existing of the 
Ancient Britons, with their earthworks and fortifications 
still existing. I have told you of a visit to, and produced 
relics from, the camp of Drusus, on the Taunus, unearthed, 
like another Pompeii, to let us know exactly how these 
ancient Romans settled themselves, and secured themselves, 
when away from their fellows, in strongholds and central 
camps, amongst a hostile population. I have done, although 
much remains which might be of interest, and which may, 
perhaps, be reserved for a future occasion. 
ON THE COAL-MEASURES OF THE NEIGHBOURHOOD OF 
ROTHERHAM. BY A. H. GREEN, M.A., F.G.S. OF THE GEO- 
LOGICAL SURVEY OF ENGLAND AND WALES. 
In a paper read before this Society last year, at Barnsley, 
I gave a general sketch of the geology of the Carboniferous 
rocks of the North of England. I propose to-day to describe, 
rather more in detail, that portion of the Carboniferous 
group which contains the thick workable coals and is 
known as the Middle Coal-measures, as it is found over the 
country lying between this town and Flockton. With this 
tract I have had opportunities of making myself tolerably 
familiar; of the remainder of the Yorkshire Coal-field my 
knowledge is as yet too meagre to allow of my attempting 
its description ; but when I shall have pushed on my work 
