CONTENTS. ix 
TRANSACTIONS OF THE SECTIONS. 
+ [An asterish * indicates that the title only is given. The mark + indicates the same, 
but with a reference to the Jowrnal or Newspaper in which it is published in extenso. ] 
Section A.—MATHEMATICAL AND PHYSICAL SCIENCE, 
Care Town. 
WEDNESDAY, AUGUST 16. 
Page 
_ Address by Professor A. R. Forsyru, M.A., D.S:., F.R.S., President of the 
(1 EE so ertttedl Qa Oe eat Aba aol Mie 2 Ra net ince era Aether er Se Se act eg 307 
1. Observations on Atmospheric Electricity in South Africn. By Professor 
J.C. Beatriz, D.Sc., J. Lytu, M.A.,.and W. H. Logevan, M.A. ...... 318 
2. Apioidal Binary Star-Systems. By AtpxanpeR W. Roserts, D.Sc., 
eee teres (D249) statrec bh deiaed «ie ekteo! Sada vechade's doe ves Gee adseidsdvvewdcnkios «ae ds . 318 
8. On the Convergence of a Reversed Power Series. By Professor A. 
BSROM IN MA: 7S ceebes Sent Ie ae wel o Reese Me miens -ole Maschinen totus deat 318 
4, On Instruments for Stereoscopic Surveying. By H. G. Fourcant......... 321 
5. On Japanese Mathematics. By Professor PAUL HARZER......000.:02:s008e0s 325 
THURSDAY, AUGUST 17. 
1. On Star Streaming. By Professor J.C, KAPrBEYN (p. 257) .......ccsceeeeees 330 
2. The Magnetic Survey of South Africa. By Professor J. C. Brarrie and 
Se URBAN St Larrea cbt otdrash cath oonsy caw dendeatats tate se verhnytons ieterind 330 
3. tThe Radioactivity of Ordinary Matter. By A. Woop, B.A., B.Sc....... 330 
4, Thermal Radiation at Very Low Temperatures. By J. T. Borromzezy, 
BED, D St Plessis accte. ACPRECD ACEH net ELE CORCUR Se Find 4 SOCRTE (RCC LCeRe 330 
5. *A Simple Form of Gas Thermometer. By J.T. Borromizy, LL.D., 
Pes RRsat cage cei Caan ade Gugade da daniaunadujatvanncsvancnsranssceenet tee 333 
6. The Diminution of Entropy according to the Kinetic Theory of Gases. 
ANSELM CS a ES Ry So ee nea ere 333 
7. The Daily Variation of the Northerly (X), and the Easterly (Y) Com- 
ponents of the Magnetic Intensity at Cape Town, St, Helena, and Mauri- 
fidnee dey roressor J.C. BaATIIE, USC, oo ...ceccesccusonseshogvevesoedescoeons 333 
FRIDAY, AUGUST 18. 
1. *Geodetic and Gravitational Observations in Spitzbergen. By Dr. O. 
BACKLUND .......s0seeee tesencesoens Rasstets cUaatcschattnacanti ven tte<t Ssehereepasn we. B04 
