206 Scientific Proceedings, Royal Dublin Society. 
relatively oldest, or belonging to the oldest division. It seems to 
me that this name, which is a relic of archeic geology, though 
standing on the map with a modernized meaning, is a very in- 
teresting indication of the far back time when the map was com- 
menced ; and I for one should have regretted very much if this, 
the only remaining indication, had been expunged. As a provi- 
sional name, consisting for convenience of a single word, probably 
“ Primary” is as good as any for those unquestionably ancient 
metamorphic, and therefore disguised, rocks. If they were simply 
marked as metamorphic, that would not necessarily exclude their 
being as late as of Ooliticage. Very likely it may never be possible 
to determine the age of some of those rocks. Jukes thought it 
probable that some of them in the N.W. might be Pre-Cambrian ; 
it is supposed by some, as Prof. King and Mr. Kinahan, that some 
of those in the W. so marked are Cambrian ; and the fossil evi-° 
dence obtained by Prof. King only last year shows that some of 
the Donegal “ primary” rocks are Lower Silurian. Let us hope 
that the investigations of the Geological Survey may result in 
the determination of these points. 
We find in more than one place in Griffith’s writings that he 
was projecting “an extended work explanatory of the details of 
his Geological Map,” but that he was prevented from beginning 
it by his various public employments. I am informed that he 
did begin to write such a work after his retirement from the 
Valuation Survey, but that it is to be feared that it never was 
finished. It is earnestly to be wished that whatever writings on 
the subject of the Geology of Ireland he shall have left behind 
him may soon become accessible to us. If it be said that we 
surely ought to be content with his map, we reply that it is the 
very excellence and completeness of that map that makes us so 
desirous of possessing whatever else may have come from the 
same hand. 
As we have been dwelling upon the first Geological Map of 
Ireland, and have incidentally mentioned that of England, it is 
appropriate that we should record, and it is a curious coincidence 
that we should have to record, the death of Alexandre Felix Gus- 
tave Achille Leymarie, which took place within a fortnight of 
the departure of Sir Richard Griffith. He is reported to have 
constructed the first geological map of France. He was Professor 
