ON THK UAINFALL Or THE BHITISH ISLiSS. 91 



YOEKSHIBE. 



Mr. Gibbius reports, at the N.W. of Bradford, a few wliinstoue boulders 

 similar to tho rocks at Scaw Tell, Cumberlaud, contaiuiug small garnets. 



To give completeness to their Koport, the Committee propose to catalogue 

 from time to time notices of remarkable erratic blocks which may appear. 



The following papers by Mr. D. Mackintosh, F.G.S., contain notices of 

 the positions, dispersion, and derivation of many boulders in the North and 

 West of England and in North Wales : — ' Quart. Journ. Geol. Soc' for Nov. 

 1867, Terminal Curvature of Slaty Laminse in W. Somerset; for June 1869, 

 Correlation of the Drifts of N.W. Lancashire &c. ; for Nov. 1872, Sea-coast 

 Section of Boulder-clay in Cheshire ; for Aug. 1873, The more remarkable 

 Boulders of the N.W. of England &c. ; for Dec. 1874, Additional Eemarks on 

 Boulders, with a particular reference to those of North Wales. ' Geological 

 Magazine ' for Sept. 1867, Railway Geology, from Exeter to Newton Bushell 

 and Moretonhampstead ; for Aug. 1870, Dispersion of ShapfeU Boulders ; for 

 Oct. 1870, Origin of tho Drifts &c. of the Lake-district ; for Dec. 1870, Dis- 

 persion of Criffell Granite &c. over the plain of Cumberland ; for July 1871, 

 Drifts of the W. and S. borders of the Lake-district, and tho three Great 

 Granitic Dispersions ; for Jan. 1872, Age of Floating Ice in North Wales ; 

 for Sept. 1872, Glacial Drift of tho Central Part of the Lake-district, up to 

 2800 feet above the sea ; for Feb. 1874, Section of Preglacial White Clay and 

 Sand near Mold. ' Proc. of W. Eiding Geol. Soc' for 1870, Drift-deposits 

 of the West Eiding of Yorkshire &c. 



The perpetual destruction of erratic blocks going on throughout the 

 country renders the Committee anxious to receive further reports. Tho pro- 

 blems to be solved are of large geological importance, and bear directly upon 

 the extension of the ice-fields and the ocean cm-rents, the elevation and sub- 

 sidence of the land, and tho divisions of the periods in the glacial epoch. 



Heport of the Rainfall Committee for the year 1874-75. The Com- 

 mittee consists of C. Brooke^ F.R.S., Chairman, J. F. Bateman, 

 C.E., F.R.S., Rogers Field, C.E., J. Glaisher, F.R.S., T. 

 HawksleYj C.E., The Earl of Rosse, F.R.S., J. Smyth, Jun., 

 C.E., C. ToMLiNSON, F.R.S., G. J. Symons, Secretary. 



Your Committee have taken all the steps in their power to complete the 

 reduction al work already in hand, and have succeeded with two exceptions, 

 each of which is only partial. The first, and one which is essential to the 

 completeness of our work and invaluable to all future inquirers, is a list of 

 all observations made in the British Isles from the earliest to the present 

 time. The second is an abstract of about 800 position returns, which wiU 

 indicate the value to be attached to the different current observations. Both 

 of these works are in a very forward state. 



With a view to facilitate reference to our reports, and of placing before 

 the Association an epitome of what we have done, our Secretary has em- 

 bodied in this Report a ^precis of the rainfall work done by your Committee. 



