﻿280 Canadian Record of Science. 



formed but very sharp boundary against the table-lands, 

 to the north of which they lie. To these table-lands 

 belong all Africa south of the Atlas, Arabia with Palestine 

 and Syria, and the peninsula of East India. The high 

 Drakenberg Mountains of the colony of Natal or the 

 Ghats on the western edge of the Indian Plateau are not 

 true mountains but broken-off table-lands, and when one 

 has ascended them, a more or less flat high table-land 

 is seen. 



In this way the old world is divided for us into two 

 parts, the boundaries of which do not coincide with 

 the present divisions of the world. We call all land 

 north of the outer edges of the boundary curves above 

 named, Eurasia, and the table-lands lying to the south are 

 indicated by the word Indo-Africa. Indo-Africa, therefore, 

 extends from the mouth of the Wadi Draha on the 

 Atlantic to the mouth of the Brahmaputra on the Bay of 

 Bengal. 



Let us glance for a moment at the other parts of 

 the earth's surface. Both North and South America 

 exhibit the remarkable phenomenon of being in the main 

 folded towards the west, that is towards the Pacific Ocean. 

 At Williams Sound, south of the peninsula of Kenai, there 

 succeed to the arc of the Aleutians the series of the 

 Western system of North American folds, which are 

 continued in Lower California and Mexico. South of the 

 Gulf of Tehuantepec the conditions change and relations 

 appear which exhibit a certain similarity to the curve of 

 the Western Mediterranean. The following is observed : — 



In the north of Venezuela series of folds occur which 

 run from east to west and which reach their clearest 

 expression in the contour of the Island of Trinidad. It 

 seems that these folds find their continuation in Tobago 

 and the Lesser Antilles. With approximate certainty 

 one follows through the Lesser Antilles the trace of a 

 mountain system which comes over from the Virgin 



