200 MINERALS COLLECTED 



near the Resident's house, by cutting a road on the slope of the hill, 

 are three and four feet in diameter, consisting of concentric layers of 

 about an inch in thickness. 



The specimens No. 4, (C) are from the bottom of a large well, on the 

 slope of the hill, but near its base, in the Residency compound. These 

 specimens were met with in an attempt to sink the well deeper, it then 

 being, perhaps, from thirty to forty feet ; the upper part of the rock had 

 been wacken and basalt ; but on reaching this rock the well-diggers were 

 stopt, they could not get through it either by cutting or blasting, from the 

 extreme state of induration and toughness of the rock. 



On the northern side of the hill, in sinking a well, the first twenty or 

 thirty feet were of this decomposed rock No. 5 (D) ; below was gneiss, more 

 or less decayed. The gneiss was no where to be traced on the surface, and 

 immediately north, beyond a little hollow of about one hundred or one hun- 

 dred and fifty yards, was a rising swell connected with the trap hills, and 

 which, to the extent of the depth of numerous wells sunk on it, was com- 

 posed of wacken, chiefly nodular, soft and light coloured at top, but in- 

 creasing in density and darkness of colour as the depth increased. This 

 swell, or tongue of trap, runs down to the city, and as far as the colour 

 showed, it appeared to have been situated on trap only ; but a quarry in 

 the centre of the town discovered gneiss almost immediately under the 

 surface. The upper layer of decayed and decaying gneiss was carted in 

 considerable quantities for repairs of roads ; the under strata were much 

 broken into cubic masses of small size, as if greatly disturbed by some 

 most powerful agent. This stone was commonly used in the city for 



rough 



(C) Hornblende Schist, and Mica Schist, or Gneiss. 



(D) Decomposed Gneiss. 



