61 1 



garnets. These garnets, of a very line red, are 

 found in the gruenstein alone, and not in the 

 gneiss, which serves as a cement to the balls, 

 or in the mica-slate, which the veins traverse. 

 The gneiss, the constituent parts of which are in 

 a state of considerable disaggregation, contains 

 large crystals of feldspar ; and, though it forms 

 the body of the vein in the mica-slate, it is tra- 

 versed itself by threads of quartz two inches 

 thick, and of a very recent formation. The 

 aspect of this phenomenon is very curious: it 

 appears as if cannon-balls were embedded in a 

 wall of rocks. I also thought I recognized in 

 these same regions, in the Montana de Avila, 

 and at Cape Blanco, East of La Guayra, a gra- 

 nular diabasis, mixed with a small quantity of 

 quartz and pyrites, and destitute of garnets, not 

 in veins, but in subordinate strata in the mica- 

 slate. This mode of position is unquestionably 

 to be found in Europe in primitive mountains 5 

 but in general the granular diabasis is more 

 frequently connected with the system of transi- 

 tion rocks, especially with a schist ( Uebergangs- 

 thonschiefer) abounding in beds of lydian-stone 

 strongly carburetted, of schistoid-jasper*, ara- 

 pelites -f, and black limestone. 



Near Antimano all the orchards were full of 



* Kieselschiefer. 

 + Alaunschiefor. 



