Reports & Proceedings — EdinburgJc Geological Society. 183 



Wheal Rose, Sitliney. Paralaurionite occurs with phosgenite in 

 a very similar specimen in the collection of the late H. J. Brooke, 

 said to come from Wheal Confidence, Newquay. 



A. Russell : On a discovery of pitchblende at Kingswood mine, 

 Buckfastleigh, North Devon. 



Pitchblende occurring in a north and south lode associated with 

 chloanthite and native bismuth is described. The discovery 

 shows promise of being of some economic importance. 



W. A. Richardson : The distribution of oxides ia Washington's 

 collected analyses of igneous rocks. 



Frequency curves are given for all the oxides and show considerable 

 differences from those previously published. The silica curve is 

 the most interesting and shows two maxima, one at 52 j^er cent 

 and the other at 72 per cent SiO.,. The frequency curve for SiO.^ 

 can be matched by a combination of two normal curves of error with 

 origins on the 52 and 72 per cent lines. 



W. A. Richardson : A simplification of the Rosiwal method of 

 m.icro-analysis. 



A method is described by which, using a drawing apparatus, 

 the lengths of component minerals of a rock can be projected on 

 to separate strips of paper and directly summed. 



Dr. A. ScHOEP : On the absence of cobalt in cornetite from 

 Katanga, Belgian Congo. 



Microchemical tests made on carefully selected crystals from the 

 original locality (Star of the Congo mine) prove that cobalt is present 

 only in associated black spots of heterogeuite. The mineral is thus 

 a hydrated phosphate of copper, agreeing completely with that 

 recently described from Northern Rhodesia. 



Edinburgh Geological Society. 

 I6th Noveniber, 1921. 



1. " Note on the Dry Valley of Windy Gowl, Carlops." By 

 the President, T. Cuthbert Day, F.C.S., F.R.S.E. 



Mr. Day called the attention of students of Glacial Geology to this 

 remarkably fine example of a glacial " Dry Valley ", as one worthy of 

 further study. He pointed out that Windy Gowl was probably 

 a feature in the landscape before the time of the Ice Age, being 

 partially carv^ed out by the usual agents of erosion working along 

 a narrow belt of land, where the underlying rocks have been 

 shattered through faulting. 



2. "The Glacial Strand-lines of Loch Tulla." By J. 

 Mathieson, F.R.S.E., and E. B. BaUey, M.C., B.A., F.R.S.E. 



High-level strand-lines occur above the head of Loch Tulla at 

 altitudes of 1,041, 1,030, 1,020, and 816 feet above O.D. Of these 

 levels the first and last have been determined by trigonometrical 

 observation, the others by estimation. 



