43 



or more branches which afterwards re-unite into one , of many being rectilinear but many 

 being undulating and bent in short waves , and lastly of the axes of the channels and the 

 striae in their interiour having the same general direction as the depressions of the neigh- 

 bouring country. Mr. Hortner refers to the Bulletin of the Geological Society of France 

 (tome III p. 6S) for some important views as to the causes of these phenomena. I have not 

 access to the Bulletin , and cannot venture in my ignorance of the rocks and all other 

 details , to make any further remarks on the analogy between the channels described by 

 M. Durocher and those of Pulo Ubin ; but it is probable that the structure of the rocks 

 will be found in the one case as in the other to have facilitated the erosion of the chan- 

 nels , and partly given them their directions. 



Singapore, ist. Oct. 1846. 



