712 
Proceedings of the Royal Irish Academy. 
In the Silurians Old Red Sandstone type) of Cork, Kerry, Mayo, 
Roscommon, Tyrone, &c., there are masses and courses of eurite that 
have shaly margins, and that graduate in places into congiomeritic and 
tuffoid rocks ; while in the Devonians of Cork there are whinstones that 
have similar peculiarities. In Limerick and Cork there are shaly 
margins, and in places breccias as adjuncts to the Carboniferous whin- 
stones, while the Eocene whinstone of Antrim has these associated tuffs 
and conglomerates, which are conspicuous at the volcanic centre, near 
Carrigarede, Co. Antrim. If the rocks of the Carrigarede district 
were metamorphous the results would, I believe, be rocks representing 
all the stages of the so-called " Old Boy " of Sutherland. 
In connexion with the more recent volcanic rocks, Cotta mentions 
the marginal brecciated stuff which he calls "friction breccia" — such 
adjuncts are also described by the American geologists, by Admiral 
Smythe, in Teneriffe, and by Yalentine Ball, in India — the latter 
exhibiting models of some of them in the new Science and Art 
Museum, Dublin. 
From the foregoing it is evident that in Ireland alone — and 
probably in numerous other places with which I am not personally 
acquainted — whinstones and the allied eurites, have as adjuncts shaly 
and congiomeritic varieties similar to those that in metamorphic 
regions are nearly universally the adjuncts of the masses and courses 
of hornblende rocks. Why, therefore, should not these adjuncts in 
both the altered and unaltered rocks have the same origin, instead 
of drawing in shearing to account for them in the metamorphic areas ? 
Dr. Hull, in consultation with Sir A. C. Rarasay. So mucli so, that the major 
portions of four of the inch sheets were ordered to be obliterated by the Ordnance 
Survey, and one (Sheet 148), at least, was re-engraved. My work, however, was 
in its turn condemned by Dr. A. Geikie, who stated that Du Noyer's work was more 
correct. Yet if the ground is examined, on my six-inch working maps every rock- 
exposure Yisible, while I was in the country, is mapped, and from the informa- 
tion thus obtained my one-inch maps were prepared. On the only maps now 
procurable by the Public all the inaccuracies of the early traverses and the subse- 
quent re-survey are to be found. Consequently, they are more calculated to 
mislead than enlighten the public. "Who can find on them the beds of iron ore in 
the Co. Wexford ? or the whinstones quarried for paving sets in the Co. Wicklow ? 
Or where on the ground will be found the granite in many of the places so marked 
on the maps ? also, who can make the descriptions in the memoirs to agree with 
the maps? Map sheet 158 represents the old survey, while the published descrip- 
tion is that of my condemned work. Similarly, the revised memoirs of sheets 
138, 139, 148, and 149, by Messrs. Hull, Hardman, and Cruise, do not tally 
with the published maps. 
