614 Mr. J. Beete Jukes and the Rev. Samuel Haughton on the 



igneous rocks, occurring in well-marked bands in the slates, and apparently 

 contemporaneous with them. They are found in two distinct bands, one to 

 the north, between Arklow and Wicklow ; and the other, apparently of the 

 same age, to the south, in a narrow band, lying at each side of a line drawn 

 from Gorey through Waterford to Ballyvoil Head. The following remark on 

 the relative directions of the granite axis, the granite patches, and the trappean 

 deposits, may be useful : — 



Granite Axis. Bearings. 



Lugnaquillia to Mount Leinster, . . 29°E. ofN. 

 Kippure to Lugnaquillia, .... 14 „ 

 Kippure to Mount Leinster, ... 24 „ 



Mean bearing, . . 22° 20' E. of N. 



The mean direction of the Longmynd system of M. Elie de Beaumont, 

 referred to Milford Haven, is 24° 24' E. of N. 



The Longmynd system is antecedent to the Silurian deposits of Wales. 



2. Granitic and Trappean Patches ; Bearings. — If a line be drawn through 

 the axis of the CooUattin patch, it will pass along the Ballynaclash granite, 

 and if produced southwards will bisect the line joining Stradbally and Kilmac- 

 thomas, in the county of Waterford. On the other hand, a line drawn through 

 either Camaros or Oulart granitic patches, in the direction of their axes, will 

 reach the same point. 



The first of these lines, which represents the mean direction of the granitic 

 patches of the northern district, is also the mean direction of all the trappean 

 patches, both northern and southern. 



The direction of this line is 



42°30'E. ofN. 



It does not deviate much from the system of the Hiindsruck, which at Milford 



Haven has the bearing — 



48° 48' E. of N. 



It is, perhaps, not merely by accident, that a line drawn from the point 

 half-way between Kilmacthomas and Stradbally to Tuskar Light, passes along 

 the line of junction of the Carnsore granite and the altered slates of the ex- 

 treme south-east of Ireland. The meaning of these facts is not known, but 



