Geology. — ''On the Volcanoes in the Island of Tidore {Moluccas)" . 



Bj Prof. A. WiCHMANN. 



(Communicated in the meeting of December 28 1918). 



The finest view to be had from the landing stage of the capital 

 of Ternate is that of the slender peak of Tidore, the most regular 

 volcanic cone of the Moluccas, at a distance of about 13r, km. 

 Directly the voyager arrives, he becomes aware that the peak is 

 not isolated but that some of its slopes are concealed by some 

 smaller mountains, stretching as far as the North Coast of Tidore. 

 A capital picture of it is given in the publication of the Siboga- 

 Expedition, which is reproduced below ^). (Fig. 1). A graphical plan 

 of it has also been made by F. H. H. Guillemard^. The volcano affords 

 quite a different aspect, when one approaches the island from the 

 south. No other hill-formations, either from this or from the West- 



Fig. 1. The Island of Tidore, seen from the N.-W. 

 side, hinder^) the view of the volcano, which rises so gently from 



1) Max Weber. Introduction et description de rexpédilion: Siboga-Expeditie 1. 

 Leiden 1902. p. 63. 



2) "The Cruise of the Marchesa to Kamschatka and New-Guinea". 2. London 1886, 

 p. 228. K. Martin's representation (Reisen in den Molukken. Geolog Theil. Leiden 

 1903, p. 59) is less accurate. 



3) A. R. Wallace mistakenly speaks of rugged- looking hills south of the peak 

 ("The Malay Archipelago" 2. London 1869, p. 24. — A. R. Wallace— P. J. Veth. 

 "Insulinde" 2. Amsterdam. 1871, p. 30). 



As early as 1856?. Bleek kr wrote: ("Reis door de Minahassa en den Molukschen 



64 

 Proceedings Royal Acad. Amsterdam. Vol. XXI. 



