BY H. I. JENSEN. 



587 



11. A review of each alkaline province is given, that of 

 Eastern Australia being given special consideration. 



12. Finally it may be stated that the hypothesis suggested, 

 though in the present state of our science incapable of proof, is 

 based on scientific principles and scientific evidence; hence it 

 should be worthy of the consideration of other workers whose aid 

 is solicited in getting further evidence for or against it. 



If I have not succeeded in convincing readers of the probability 

 of my suggestions as to the origin of the foyaitic magma, I believe 



Fig. 12. — Relation of the Direction of Outcrop of Alkaline Rocks 

 to the Triassic and Trias-Jura Coast-line. 



that I have in this paper summarised all the main facts of interest 

 and importance to students of alkaline rocks, and pointed out 

 some problems which demand their investigation. 



Maps are supplied (figs. 10-1 3) showing the relationship of the 

 trachyte-line to the shore-lines of the Triassic (and Trias-Jura) 

 and Cretaceous seas are appended (figs. 12-1 3), and I have also 



