140 FORMER LAND CONNECTIONS. 



Tertiary beds were buckled up into folds, as can well be seen in 

 the Atlas Ranges. 



For reasons given already any such link would with more- 

 likelihood have consisted not of an isthmus, but rather of a chain 

 of islands, of which the Cape Verde and Canary Islands would 

 constitute the remnants. It is for biologists to determine whether 

 the evidence favours either the single or the double connection, 

 and, if the former, just where it should be placed. 



It is peculiarly interesting to recall that the reputed Continent 

 of Atlantis, from which this ocean basin derives its name, was 

 believed to have lain in this quarter, and that according to certain 

 students of the question the story of its engulfing is an actual 

 tradition and no mere myth, its submergence being regarded by 

 them as having taken place during the existence of mankind. 



In concluding, the many imperfections in the presentation of 

 this discourse are admitted, for on certain points, as it happens, 

 our knowledge is of the vaguest. The many sided nature of the 

 problem actually demands for its solution the collaboration of 

 specialists in the several branches of science concerned. 



LIST OF PAPERS READ AT THE SECTIONAL MEETINGS 



Section A. — Astronomy, Mathematics, Physics, Meteorology, 

 Geodesy, Surveying, Engineering, Architecture and' 

 Irrigation. 



MONDAY, JULY 11, 1921. 



1. Presidential Address on "Stellar Distances, Magnitudes and Move- 



ments," by J. Lunt, D.Sc. 



TUESDAY, JULY 12. 



2. Purification of Sewage by the Activated Sludge Process : R. J. 



Norris, M.R.San. I. 



WEDNESDAY, JULY 13. 



3. Asphalt in Relation to Road Construction: D. B. W. Alexander. 



4. Some Notes on the Occurrence of Even Harmonics in Electrical 



Pressure and Current Waves: H. Clark, B.Sc, A.M.I.E.E. 



Section B. — Chemistr-v, Geology, Metallurgy, Mineralogy 



and Geography. 



TUESDAY, JULY 12. 



1. Presidential Address: "The Atomic Theory in 1921," by J. Mont, 



M.A., D.Sc, F.I.C. 



WEDNESDAY, JULY 13. 



2. Alcohol fuels for internal, combustion engines: C. W. Petchell. 



3. Notes on the chemical control of Cattle Dipping Tanks: C. O. 



Williams, B.Sc. 



4. Condensed Milk in South Africa from the chemist's point of view : 



A. Kloot, B.Sc, A. I.C., and L. Hyman. 



5. On the mechanical analysis of Soils containing heavy Minerals : 



B de C. Marchand, B.A., D.Sc. 



