INTRODUCTION. 147 



of their geological observations appeared in the Comptes 

 Rendus for 1844, vol. xix. p. 881 ; but a much more 

 extended account was given in the third volume of their 

 "Voyage en Abyssinie," published in 1847. The first 

 seventy-six pages of this volume, which is filled with 

 the scientific results of the journey, are devoted to the 

 geology. Numerous remarks on the same subject are 

 scattered throughout the first two volumes, containing 

 the narrative of the personal adventures of the two 

 travellers ; and the accompanying atlas comprises a 

 geological map of Tigr^ and Simen, and several geo- 

 logical sections. 



The work of Messrs. Ferret and Galinier is by far the 

 most important contribution to the geology of Abyssinia 

 which has hitherto appeared, and the greatest credit is 

 due to those gentlemen, not only for the great energy 

 and research displayed by them, but also for the ad- 

 mirably clear description of the observations which they 

 have furnished. That they had but little previous expe- 

 rience of field geology is probable, and I am obliged to 

 differ from some of the conclusions at which they have 

 arrived ; but the value of their observations is in no way 

 impaired. 



Messrs. Ferret and Galinier divide the rocks observed 

 by them into the following systems : — 



' granite 

 gneiss 

 " 1. Terrains primaires . , . T. gneissique . . . •] micasehiste 



protogine 

 . talcschiste 



l2 



