and the other Channel Islands. 15 



have been washed out of them, are, coarse yellow, brown, red, and 

 green jaspers, sometimes containing veins of iron ochre, or crystals of 

 hornblende, or passing on the one hand to quartz, and on the other to - 

 hornstone. Sometimes they are veined with quartz, and striped and 

 waved of various colours, with mixtures of quartz and calcedony, 

 resembling agates. 



The Peninsula of Little Sercq is connected with the main island 

 by the high narrow ridge before mentioned. This is about three 

 hundred yards in length, and has a precipitous face to the sea on the 

 eastern side ; to the weft it is also partly rocky and precipitous, and 

 the remainder is a steep declivity of broken rocks and rubbish. It is 

 called the Coupee, and on the top of it is a rugged path of frightful 

 appearance, being in many places not above a yard or two in 

 breadth, and in most without boundary on either hand. By this, 

 the communication between the two parts of the island is kept up. 



This narrow neck is traversed by a vein of porcelain clay at its 

 widest part, ten or twelve feet in thickness, and lying E and W 

 across it. 



In most places this vein is much contaminated by purple, red, and 

 yellow oxides of iron, and intersected by reticulations of quartz, which 

 are probably the remains of veins running through the granite, from 

 the decomposition of which the porcelain clay appears to have origi- 

 nated. Grains of quartz are also found dispersed through it, and 

 indeed in many places it seems to be little altered from its original 

 granite. Towards the bottom of the vein various substances are 

 found, among which are coarse approaches to calcedony and agates ; 

 but the greater and apparently the most interesting part of the vein 

 was inaccessible to me, in consequence of huge masses of fallen rocks. 



In some places are veins of quartz having a slaty fracture, and 

 becoming earthy, or much discoloured with iron, or containing 



