CONTENTS. 



Minutes of Proceedings and Prksident's Address 



List of Members . ... 



An Introduction to the Study of South African Rainfall 

 By J. R. Sutton, M.A., F.R.Met.S. 



Factorizable Continuants. By Thomas Muir, LL.D. 



Developments of a Pfaffian. By Thomas Muir, LL.D. 



PAGE 



. i-xl 

 xli-xlv 



1 

 29 

 35 



High-level Gravels of the Cape and the Problem of the 

 Karroo Gold. By Ernest H. L. Schwarz, A.R.C.S., 

 F.G.S. . . . . . .43 



The Sutherland Volcanic Pipes and their Relationship to 

 other Vents in South Africa. By A. W. Rogers, M.A., 

 F.G.S. , and A. du Toit . . . . .61 



On Two New Therocephalian Reptiles (Glanosuchus macrops 

 and Pristerognathus Baini). By R. Broom, M.D., B.Sc, 

 C.M.Z.S. . . . . . . .85 



The Origin of the Mammalian Carpus and Tarsus. By 



R. Broom, M.D., B.Sc, C.M.Z.S. . . .89 



Mimicry among Plants. By R. Marloth, Ph.D., M.A. . 97 



Observations on the Structure of Mesosaurus. By R. Broom, 



M.D., B.Sc, C.M.Z.S/ . . . .103 



Descriptions of New Genera and Species of South African 



Spiders. By W. F. Purcell . . . .115 



South African Verbenacea. By H. H. W. Pearson, M.A., 



F.L.S. . . . . . . .175 



