Geology of the Harz Mountains. 209 



vom Innern der Gebirge/* in which the rocks of the Harz 

 were for the first time described. 



AmoDg the great names associated with the explorations 

 of the Harz in the past, may be mentioned those of Lasius, 

 Freiesleben, Hausmann, Fr. Hoffmann, von Buch, Ch. Zim- 

 mermann, and F. A. Eoemer, to which must be added those 

 of our own countrymen, Murchison and Sedgwick; while 

 the present generation is represented by such well-known 

 " Forscher " as Lossen, Beyrich, von Groddeck, and Kayser, 

 who find in the rocks of the Harz an ever fruitful field for 

 original investigation and discovery. 



About two years ago Professor K. A. Lossen of Berlin pub- 

 lished a very beautiful and minutely detailed geognostic map 

 of the Harz and surrounding country on a scale of 1 : 100,000, 

 on which no less than ninety different kinds of rock, etc., 

 are indicated by various colours and signs; and last year 

 (1883) my esteemed teacher, Dr Alb. von Groddeck, Director 

 of the Koyal Mining Academy at Clausthal, issued the second 

 edition of his little volume, "Abriss der Geognosie des 

 Harzes," which is intended to accompany the map as an 

 explanation, since no large descriptive memoir on the geology 

 of the Harz has yet appeared. 



With the exception of the valuable pioneering papers by 

 Murchison,^ and sundry casual notices in text-books and 

 periodical journals, nothing appears to have been written in 

 English on the Geology of the Harz Mountains; and it is 

 now my wish to fill up, however imperfectly, this blank in 

 our scientific literature by seeking to give an outline of the 

 geological structure and history of that delightful region. 



During my residence in the Harz, while studying for two 

 sessions at the Eoyal Mining Academy at Clausthal, I had 

 numerous opportunities of examining the geological structure 

 of the range. Both in the lecture-room and in the weekly 

 excursions to the metal mines or to field sections, I enjoyed 

 the pleasure of Listening to Dr von Groddeck's valuable 

 exposition of the Geology of the Harz. But in addition 

 to these excursions, I made a series of independent traverses 



^ See Appendix. 

 VOL. VIII. 



