8o6 THE JOURNAL OF GEOLOGY. 



us specimens of what we know to be definitely the latest products 

 of eruption. 



The fact of an eruption having taken place here in historical 

 times raises the question whether the volcanic forces of the 

 region are extinct, or merely dormant. The hot springs of 

 Methana and probably the mofetti of Sousaki are apparently the 

 last visible signs of volcanic activity, and it seems almost certain 

 that the volcanic forces of ^Egina and Methana are quite 

 extinct. But on the other hand, when we recall the long periods 

 of absolute repose that we know to have lasted in some cases 

 between two volcanic eruptions, as that of about seventeen 

 centuries at Ischia, we cannot feel absolutely sure that some time 

 the dormant forces will not be roused, and that we shall not have 

 a fresh chapter to add to the vulcanological history of Methana. 



Poros. — The only part of this island (which lies immediately 

 to the southeast of Methana) which is of interest in the present 

 connection is the small promontory on the south coast on which 

 the town of Poros stands, connected with the main part of the 

 island (composed chiefly of Cretaceous slates and limestones) by 

 a low sandy isthmus. This small peninsula is a bare rocky hill, 

 a mass of gray and reddish hornblende-andesite, the difference 

 between the two colors being due only to weathering, as Philipp- 

 son 1 has pointed out. No traces of a crater are to be seen, and 

 the hill is evidently due to an eruption of the domal type which 

 probably took place in the Quaternary period. 2 Some well- 

 stratified tuff beds, with a dip about 20° to the north, are to be 

 seen near the shore in the town. 



Kolautziki. — As my examination of the occurrences of eruptive 

 rock on the mainland of Greece was confined to collecting at the 

 railroad cutting west of the small village of Kolautziki I shall 

 draw largely on Philippson's description. 3 Near Kalamaki, 

 which is on the east side of the Isthmus of Corinth, there is 

 found an eruptive rock which Philippson calls a quartz-trachyte, 



'Op. cit., p. 46. 



2 Philippson: op. cit., p. 433. 

 3 Op. cit., pp. 21 ff. 



