Temperatures of the Air observed at Moohudi. By 
E. J. Sutton. Sc.D., RB.S.S.A 163 
On the Porosity of the Eocks of the Karroo System in South Africa. 
By A. L. Du Toit, D.Sc, F.G.S 169 
The Secular Variation of the Magnetic Elements in South Africa 
during the period 1900-1913. By J. C. Beattib, D.Sc. 
(Plates I., II.. III., and Two Text-figures.) 181 
Properties of Pfafi&ans, with their analogues in Determinants. By 
Thomas Muib, LL.D 206 
A Proof by elementary methods, without complex quantities, that 
every algebraic function (with real coefficients) has factors of the 
form (x^ — px + q) {p, q, real) and hence, every algebraic 
equation with coefficients real or imaginary, has real or imaginary 
roots, equal in number to the degree of the equation. By W. 
N. EOSEVEARE, M.A. 216 
On Malet's Proof that every Equation has roots, real or imaginary, 
equal in number to its degree. By W. N. Eoseveare, M.A. . 222 
Preliminary Investigation on the Deterioration of Maize infected with 
Diplodia ZecB (Schw.), Lev. By Paul A. Van deb Bijl, M.A. 
With Two Text-figures.) 231 
The Morphology of the Tadpole of Xenopus IcBvis. By T. F. Dreyer, 
B.A., Ph.D. ("With Eight Text-figures.) 241 
A Morphological Study of Strotigylus Dotiglasi, Cobbold. 
Eaffaele Issel, D.Sc. (With Eleven Text-figures.) 
By 
269 
Note on the Product of a special Jf-line Determinant by its central 
minor of the (2^-4)th order. By Thomas Muir, LL.D. . . 273 
On the Interpretation of the 'Electrocardiogram. By W. A. Jolly. 
(With Seventeen Text-figures.) 279 
On the Crystallography of Anatase Crystals from the Auriferous 
Conglomerate of the Witwatersrand. By W. Von Bonde, B.A. 
(With One Text-figure.) 299 
Minutes of Proceedings, December, 1913-October, 1914 . . . i 
List of Officers, Fellows, and Members xix 
Additions to the Library during 1913 xxiv 
