( xvii ) 
MINUTES OF PKOCEEMNGS 
OF THE 
KOYAL SOCIETY OF SOUTH AFRICA. 
E-EPOET OF THE HoN. GrENERAL SECRETARY FOR THE YeAR EnDING 
December 31, 1914. 
Six Ordinary Meetings, the Annual and the Anniversary Meetings, were 
held during the year, and the following papers were read : 
" Note on a Theorem of Ph. G-ilbert, regarding the Differentiation of a 
Special Jacobian," by T. Muir. 
" Note on Eosanes' Functions, resembling Jacobians," by T. Muir. 
''The Triple Stellar System f Virginis and S 1757," by E. T. A. Innes. 
A Curious Mosquito," by Gr. A. H. Bedford. 
" On the Porosity of the Eocks of the Karroo System," by A. L. du Toit. 
" A Note on the Temperatures of the Air observed at Mochudi," by 
J. E. Sutton. 
" Properties of Pfaffians and their Analogues in Determinants," by 
T. Muir. 
" The Secular "Variation of the Magnetic Elements in South Africa during 
the Period 1900-1913," by J. C. Beattie. 
" A Proof by Elementary Methods, without Complex Quantities, that 
every Algebraic Function (with Eeal Coefficients) has Factors of the Form 
a^-vx + q (p.q. real)," by W. N. Eoseveare. 
" On Malet's Proof that every Equation has Eoots, Eeal or Imaginary, 
Equal in Number to its Degree," by W. N. Eoseveare. 
" Note on Palaeolithic Implements of Large Size found in the Precincts 
of Capetown City," by L. Peringuey. 
" Note on G-rooved Stone Slabs, used by the Strand-looper-San Abo- 
riginals," by L. PERINGUEY. 
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