( 237 ) 



that only the valid iiihahitaiils had fled, thus leaving- the sick and 

 the old to their fate. 



In my quieting' report (coin)), (he already cited annual and 

 quarterly report) was based in the main on (he cleai-ly discernible 

 connection between the seismic dislurbance on the one hand, the 

 formation of the Pentoe-sollatare on (he other hand, and on the total 

 absence of any other symptom of increasing local activity. The 

 Sopoetan-crater. from which in the jirst place an eruption could be 

 apprehended, the more so as according to tradition its foi-mer eruptions 

 had always been |)receded by some eai'11i-(puikes, was in the same 

 state of calm and feeble fumarole-activity, as I had seen it about 

 two years previously. From two boccas in the southern part of the 

 bottom of the crater the rising of steam seemed even to have 

 somewhat diminished. As likewise the existing solfatares, and hot 

 springs, in so far as we could observe, or gather from reports, 

 did not sliow any marked change in their activity, the formation of 

 the new solfatare, also taken as a hydro-thermal i)henomenon, could 

 be considered as entirely isolated and of a local nature. 



After it was ascertained that there was no other cause for the 

 seismic disturbance, the coincidence of its beginning and maxima) 

 violence with the formation of the Pentoe-solfatare got a primary 

 importance. The causal connection which thereby had become very 

 probable was, as we have already indicated, further su[)ported by 

 the fact that the pleistoseistic region proved to agree with the nearest 

 surroundings of this solfatare. At Tombatoe the earth-pulsations were 

 not stronger than on the Tondano-plateau, and at Amoerang the intensity 

 and frequency must have agreed nearly with those at Menado. It 

 seems that on the whole the seismic phenomena, south and west of 

 the Sopoetan-mountains, were somewhat weaker than in the north 

 and the east. 



Utiyrht, Mav 1911. 



• 16 



Proceedings Royal Acad. Amsterdam. Vol. XIV. 



