xxii Transactions of the South African Philosophical Society. 



given. On account of the freshness of this rock this analysis is an 

 important addition to the few hitherto made of melilite-basalts. The 

 Spiegel Eiver rock penetrates the Uitenhage beds, and if, as the 

 authors suggest, the community of character is evidence of con- 

 temporaneity, the presence of melilite-basalt in the Sutherland pipes 

 affords a clue to their age and to that of the related volcanoes. The 

 breccias consist of a serpentinous, calcareous, or silicious ground- 

 mass containing many varieties of sedimentary rocks derived from 

 the Karroo formation, and deep-seated igneous rocks, such as gneiss, 

 granite, granulite, eclogite. The two latter are very basic and consist 

 chiefly of pyroxenes (monoclinic), brown hornblende, garnet, biotite, 

 and ilmenite. From these rocks were derived the numerous pieces 

 of pyroxene, hornblende, ilmenite, and biotite that occur in the 

 breccias. The resemblance of these breccias to the contents of 

 the pipes at Balmoral, Kimberley, Jagersfontein, the Monastery 

 mine, and the Newlands mine are pointed out, and some notes 

 on the nature of some of the Kimberley rocks bearing upon the 

 question of the original character of the magma from which the 

 blue-ground was derived are given. 



Ordinary Monthly Meeting. 

 March 30, 1904. 

 Dr. J. D. F. Gilchrist, President, in the Chair. 



Messrs. H. B. Brown and D. J. Haarhoff were elected ordinary 

 members. 



Dr. Eric France, Dr. Warren, and Professor A. Brown were 

 nominated by Messrs. W. L. Sclater and L. Peringuey, and Dr. 

 J. A. Beattie and the President. 



Two papers were read: — " On Two New Therocephalian Eeptiles 

 {Glanosuchus macrons and Pristerognathus baini)" by R. Broom, 

 M.D. 



" Note on the valuation by successive approximation of the series 

 for sin and cos in ascending powers of 0," by Professor 

 Laurence Crawford. 



Dr. R. Marloth read the following Notes : — 



1. When he visited the Matopo hills in November of last year, he 

 noticed a shrub a couple of feet high which looked quite withered. 

 It was common everywhere in the fissures or depressions of the 

 granite, but although he kept a good look-out he was unable to find 

 any fresh specimen. This was strange, for unless a special epidemic 



