A PETROGRAPHICAL SKETCH OF ^GINA AND 

 METHANA. 



PART I. 



Introduction . 



During several visits to Greece the volcanic island of /Egina 

 and promontory of Methana, which are plainly seen from the 

 Acropolis of Athens, had always presented themselves as a prom- 

 ising field for petrographical investigation. The attractions they 

 held out were enhanced by the fact that since 1867 they have 

 been unvisited, or at least undescribed by a geologist ; and as 

 the progress of petrography since that date has been so great, 

 they seemed capable of furnishing much new and perhaps inter- 

 esting material. An opportunity presented itself in March, 1893, 

 when I was able to devote a week to yEgina and Methana 

 together, with part of a day at Poros. This too short visit was 

 supplemented by a second week spent at the same localities in 

 March, 1894. A day was also devoted to visiting and collecting 

 at Kolautziki, near Kalamaki on the Athens-Corinth Railroad, 

 and at the neighboring valley of Sousaki, with its interesting 

 mofetti. The collections made on these two excursions, which 

 form the basis of this paper, are quite complete and typical of 

 the various eruptive rocks of the region ; the total number 

 of hand specimens amounting to 122. 



The predominantly petrographical character of the paper 

 here given will explain the very cursory and imperfect way in 

 which many of the geological and stratigraphical features are 

 treated, only such a short sketch and description being given a 

 may be necessary to give the reader a sufficient idea of the gen- 

 eral structure. 



For the accompanying geological map there was used as a 

 basis the British Admiralty Chart No. 15 14, which in ^Egina is 



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