470 Notices of Memoirs — Papers at British Association. 



group, the argillaceous beds of which are often highly charged with 

 sulphides, are being prospected at the present time, and gold is reported 

 to occur in many parts of this group. Group (3), though bearing 

 certain signs of mineralization, seem to have received little attention 

 hitherto. Gold also occurs in quartz veins and stringers traversing 

 the metamorphic rocks, and these are naturally not neglected. 



Iron-ore (chiefly haematite) is abundant. The huge excavation in 

 Iron Mine Hill on the eastern part of Learig Farm is said to be the 

 work of natives, who formerly smelted the ore for their own use. 

 Limestone is being burnt for lime at Chishawasha. Large deposits, 

 partly magnesian, partly a pure lime, as shown by analysis published 

 in the Agricultural Journal for November, 1910, occur on the 

 south side of Kilmuir Farm. A talc-schist of a pleasant dull-green 

 colour is being used successfully for internal decoration in the 

 Chishawasha Mission. The stone, in spite of its schistose structure, 

 carves easily and takes a good polish. 



The rocks later in age than the metamorphic series are all of 

 igneous origin. They comprise the granites, together with some 

 allied plutonic rocks more basic in composition, and a younger group 

 of dykes and irregular masses of dolerite. In addition to the immense 

 masses of granite which fringe the district under description, smaller 

 masses are intruded into the metamorphic rocks and frequently crop 

 out in the vleis. Small masses of a more basic plutonic rock are 

 occasionally found in similar positions. 



The later dolerite dykes, which are intruded into the granite and 

 metamorphic rocks alike, call for no further description here. 



The structure of the metamorphic rocks is exceedingly complex. 

 The rocks have been intensely compressed by forces acting in a north 

 and south direction, and thereby been thrown into folds ranging east 

 and west, but occasionally diverging as much as 20 degrees on either 

 side of these points. The compression has been so intense that the ■ 

 limbs of the folds have been pressed together, and now dip at the same 

 angle and in the same direction. 



II. — British Association for the Advancement or Science, Eigbty- 

 fihst Annuai, Meeting, held at Portsmouth, August 30 — 

 September 6, 1911. List of Titles of Papers read in 

 Section C (Geology) and in other Sections bearing upon 

 Geology. 

 Presidential Address by A. Harker, F.R.S. 

 Clement Reid, F.R.S. — The Geology of Portsmouth and District. 

 Professor S. II. Reynolds. — Further Work in the Silurian Rocks of 



the Eastern Mendips. 

 Dr. A. R. Diverryhouse . — The Glaciation of the North-East of 



Ireland. 

 Dr. W. F. Hume 8f J. I. Craig. — The Geological Period and Climatic 



Changes in North-East Africa. 

 Report of the Committee for the Collection, Preservation, and 



Systematic Registration of Photographs of Geological Interest. 

 Report of the Committee to consider the preparation of a List of 

 Characteristic Fossils. 



