E. H. L. Schicarz — Gold in Cape Colony. 369 



but there is a rapid transition from the pyroxenite to the granulite. 

 The course of the small sills and dykes of intrusive pyroxenic 

 material is usually determined by the foliation planes and joints of 

 the granulites or Charnockite Series. 



EXPLANATION OF PAGE-ILLUSTRATION, PLATE XX (p. 366). 

 Intkusive Pyeoxenitbs in the Ceylon Granulites, 



Fig. 1. — Intrusive pyroxenite at Ella (Uva) ; area shown about 6x4 yards. 



P, pyroxenite ; G, granulite ; F, fault. 

 ,, 2. — Pyroxenite sills and dykes, TJduwela (Central Prov.) ; length, shown about 



8 yards. P, pyroxenite ; G, granulite. 

 ,, 3. — Pyroxenite dyke with well-marked symmetrical structure, exposed in feeder 



of Badulla Oya, near Naula ; average thickness, 6 inches. P, pyroxenite ; 



G, granulite. 

 ,, 4. — Intrusive pyroxenite following foKation planes and joints in granulites 



(also in Figs. 1 and 2), Kadawat Oya bridge (Sab.) ; thickness, 6 inches. 



P, pyroxenite ; G, granulite ; J J, joints. 

 ,, 5. — 'Thread dykes,' exposed in feeder of Badulla Oya, near Naula; average 



thickness, i inch. 



Kandy, June 19, 1905. 



YI. — Gold at Knysna and Pkinoe Albert, Cape Colony. 



By Ernest H. L. Schwakz, A.E.C.S., F.G.S., 

 Rhodes University College, Grahamstown, Cape Colony. 



IN 1895 the author visited the Prince Albert Goldfields, and later 

 the Millwood Goldfields in Knysna, and has had the subject 

 constantly before him till quite recently, when, in reviewing the 

 whole question in connection with the geology of the region, which 

 he has now worked out under the auspices of the Geological Com- 

 mission of the Colony of the Cape of Good Hope, he was able to 

 come to some definite conclusions. The gradual building up of 

 convictions on a subject like this, as facts became clearer with 

 increased knowledge derived from the reports of prospectors, the 

 progress of the Survey, and the access to literature bearing on 

 kindred questions, led to the acceptance of certain general principles, 

 which the author has thought worth while to state in definite form 

 for criticism. The peculiar points in the occurrence of the precious 

 metal in these localities cause them to rank high as fields for 

 research, if not for general enrichment of the inhabitants of the 

 Cape Colony. 



The Millwood fields lie in the Outeniqua Mountains, shut off on 

 the north by high grass-covered ridges with many picturesque 

 peaks, rising to heights of about 4,000 feet, on the south by lower 

 hills covered with dense forest. The Outeniqua Mountains form 

 the first of a series of parallel chains that screen the Karroo from 

 the coast, and on the seaward side there is but a narrow coastal 

 ledge separating the foot-hills from the shore of the Southern or 

 Indian Ocean. The rainfall is abundant, but subjected to periods 

 of drought lasting from three to four months ; on the whole, how- 

 ever, one can say that there is a heavy shower once a week. The 

 ground about the goldfields is all on a steep slope, and storm-water 



DECADE V. — VOL. 11. — NO. YIII. 24 



