Anniversary Address to the Royal Geological Society. 197 
the Royal Dublin Society, which he had held for just twenty 
years. 
Though he was still continually adding to his store of facts, 
yet no material changes were made in his map until the early 
part of 1835, at which date we enter upon the second period in 
the history of the map. It is interesting to note this point, be- 
cause it shows his prudence in contenting himself during the first 
period with a copious induction of facts before doing anything 
but what was sufficiently obvious at once as to the correlation, dis- 
cussion, and interpretation of those facts. The second period in 
the history of the map was one of rapid change, improvement, 
and scientific development. Probably the reason why the second 
edition of the map was constructed at this time was that it might 
be ready for the meeting ot the British Association in Dublin in 
August, 1835 ; at any rate, it was then exhibited to the Associa- 
tion, of the Geological Section of which Griffith was President. 
In drawing up this map of 1835 he was assisted by the publi- 
cations of Weaver, Conybeare, Buckland, Berger, Nimmo, Bald, 
Bryce, &c. But, except some detached hills of quartz-rock, whose 
outlines were adopted from Weaver, and the small granite ex- 
posure of Cavan, whose limits were taken from Lieut. Stothard, the 
boundary lines on his map were the result of the observations of 
himself or of persons acting under his direction. The most im- 
portant of these observations by the officers acting under him 
were those of Mr. John Kelly (at his death one of our Vice-Pre- 
sidents) in different parts of Ireland, of Mr. Samuel Nicholson in 
the north part of Antrim, and of Mr. Patrick Knight in Mayo. 
The only printed representation of this map of 1835 is that in 
John Phillips’ “Index Geological Map of the British Islands,” 
edition of 1838 (but undated). The geology of Ireland in that 
map is taken “ by permission” from “ Griffith’s large unpublished 
map ” (but see Vote, infra). It is on the small scale of one inch 
to twenty-five miles, and doubtless many minor details are omitted. 
In the map of 1835 the leading outlines of the formations are 
given with considerable accuracy ; though in some cases the for- 
mations themselves were to be afterwards changed or left doubt- 
ful. We shall now refer only to the following particulars, which, 
for various reasons, are the most interesting. We find the Dingle 
Promontory and the whole of the country south of the line joining 
Dingle and Dungarvan Bays marked as Transition. A great change 
Scien. Proc. R.D.S., Vou, 1, Pv. m1. p 2 
