464 Notices of Memoirs— Prof. E. Hull 



Londonderry was clearly demonstrative from the heights of the 

 outcrop of the Chalk, up to elevations of a thousand feet ; and its 

 occurrence inside the basin, at Templepatrick and other places, 

 was proof of its continuity below the basaltic plateau at a low 

 level. The water, being held under hydrostatic pressure in the 

 Cretaceous beds underlying impervious clays of the Lias or Keuper 

 marls, required only to be tapped by boring through the overlying 

 sheet of basalt to yield a practically inexhaustible supply of pure 

 and wholesome water. The districts most favourably situated for 

 thus yielding water supplies by boring were near Ballymena, Bally- 

 money, Coleraine, Antrim, etc. The author stated that for most 

 localities the requisite depth to meet the Chalk could be readily 

 calculated. He also enumerated the other water-bearing strata 

 existing in the same sections, as at the lithomarge bed of the Iron- 

 ore measures, and at the lower lithomarge bed, and also at the 

 surface of the basalt if under a considerable head of drift. The 

 author strongly advocated the adoption of boring for water supplies 

 for certain districts in Ulster, as that system had been so advanta- 

 geously adopted in England. 



VIL — The Progress op the Geological Survey of Ireland.^ 

 By Professor E. Hull, M.A., F.E.S., Director of the Geological 

 Survey. 



PPtOFESSOE HULL gave a short account of the progress of the 

 Geological Survey of Ireland from its commencement in 1832, 

 tinder the late General Portlock, E.E., down to the present day, 

 stating that the whole country south of a line drawn roughly from 

 Larne on the coast of Antrim to Sligo had been surveyed, while 160 

 Sheets of the Geological Map, on a scale of one inch to the statute 

 mile, had been published. Along with these had also been issued 

 78 separate Explanatory Memoirs describing the structure and 

 palaeontology of 126 Sheets. It had been found necessary to revise 

 the geology of the Leinster and Tipperary Coal-fields, the Carboni- 

 ferous trap rock of the County Limerick, and the South-East portion 

 of the country, including parts of Wicklow and Wexford. The Coal- 

 fields of the North of Ireland had also been surveyed and published 

 in maps both on the 6-inch and 1-inch scales ; and it was also 

 intended that the districts of the County Antrim containing pyrolitic 

 iron-ores should be illustrated by maps on both scales. The district 

 still remaining to be examined included the greater portions of 

 Donegal, Tyrone, Fermanagh, Sligo, and Antrim. Professor Hull 

 entered into a brief description of the geology of the various parts of 

 Ireland. 



VIII. — On ' HULLITE,' A HITHERTO UNDESCRIBED MlNERAL.^ By 



E. T. Hardman, F.C.S. 



THE author stated that this mineral occurs in abundance at Carn- 

 inoney Hill, near Belfast, in the basalt forming the neck of a 

 Miocene volcano. It has never been described before or analyzed, 



1 Eead before Section C, Dublin, 20tli August, 1878. 



