790 THE JOURNAL OF GEOLOGY. 



very accurate in its delineation of the orographical and topo- 

 graphical features, but leaves more to be desired in the case of 

 Methana. Some names have been altered and some new ones 

 inserted, in accordance with my own notes, but otherwise the 

 map is essentially the same as the original. It is much to be 

 regretted that the construction of a complete and accurate geo- 

 logical map was out of the question, and in its geological features 

 the present map does not claim any great accuracy, and must be 

 regarded as merely an attempt to give the reader a general idea 

 of the relations of the various rock masses, whose boundaries are 

 in many cases more or less hypothetical. Though the roads are 

 bad, traveling (on horseback) is easy, the people are kind and 

 hospitable, and the only impediments are the extreme roughness of 

 the accommodations and the absolute necessity of some acquaint- 

 ance with the modern Greek language, an accomplishment not 

 very difficult to learn. It must be added that the hypsometric 

 figures, which are expressed in metres, are taken from the 

 Admiralty Chart and from the work of Reiss and Stiibel, to be 

 mentioned later. 



In conclusion, I must express my warmest thanks to Professor 

 Zirkel for his very kind advice, to Dr. H. Lenk of the Uni- 

 versity of Leipzig for making the specific gravity determinations 

 for me, and to Dr. A. Rohrig of Leipzig for the care and zeal he 

 showed in making the chemical analyses. 



Literature. — A short sketch of the previous geological descrip- 

 tions of the region must be given, as they will be often referred 

 to. The writings of the travelers prior to 1800 I have not con- 

 sulted, since their descriptions, while matters of interest, would be 

 of no petrographical value. Among the earliest in this century 

 was Dodwell, 1 who spent a day at the Acropolis of Methana, 

 recognized the volcanic origin of the peninsula, and recommends 

 it to future geologists for investigation. The first really geolog- 

 ical investigation was that made by MM. Boblaye and Virlet 3 



1 Dodwell : Tour Through Greece. London, 1819. II., pp. 281, 284. 



2 Exped. Scient. de Moree. Sect, des Sci. Physiques. Paris, 1834. Tome II., 

 2me Part. Geol. et Miner, par Boblaye et Virlet, pp. 239-258 and 364-370. Atlas, 

 ire Sene, PL I., III., V., 2me Ser., PI. IV., V. Referred to as "B. & V." 



