On Metallic Minerals. 403 



at least four miles an hour. Where the river ceases to be 

 navigable, a fall called the Falls of the (jriys, occurs and 

 it is not far from the foot of tliese falls on the right bank of 

 the river tliat the sandstone for building the hearths and 

 furnace and the limestone as a flux for the ore are procured. 

 I ^valked to these quarries by the shore of the river, and 

 shall attempt to give a geological section of the country 

 passed through. 



No rock appears on the banks of the river for thi-ce or 

 four miles; its place is supplied by a stiff clay, through 

 sections in which streams and small torrents descend, the 

 colour of whose waters often indicate the presence of iron 

 in solution ; it is less ecpiivocal when, as is also often the 

 case, a crust of the red oxide of iron is found covering the 

 rounded stones and pebbles at the mouths of these streams. 

 About one mile or thereabouts, from the works, a sulphu- 

 retted s[)ring is met with, rising in the river, and forming 

 a small jiV« d'eau above it. The smell of sulphuretted 

 hydrogen is so powerful that it is impossible to pass the 

 place without noticing it. On the dry hank opposite, down 

 wliich a small stream is trickling, a white curdy mirteral 

 is observed coating the sides of the bank, and evidently 

 <leposited by the water, which is also sulphuretted. It was 

 supposed to be either a carbonate of iron, or a sulphate of 

 linu", but no examination of it was made, to detci-mine that 

 question. 'I'he same appearance is observed at St. Paul's 

 Bay, where also chalybeate waters mix with those which 

 are sulphurttted. 



The Hrst rock which was nut with, is a fetid hhcll lime- 

 stone. Suddenly cro|)ping out of the ground — the san»e as 

 that in which the (puuTies are worked, and which are 

 •ituated near the falls, about two hundred vards from 



