The general features of a country depend on its geological structure. Granite formation, slate rock, sandstone, limestone, chalk--all have their special characters, unmistakable. When we are among the granites in the west of England we expect a tent-like shape of hill with a tor of rock at the summit; the sides strewn with a "clatter" of fallen rock, and clothed in heather and furze. When we come to the slates, and the overlying cold clays, we expect little except in the gorges and valleys cut through the strata by the streams. Of sandstone, or of chalk, forming breezy rolling downs, there is none in Cornwall, nor of limestone with its bold scars, such as are met with in the western hills of Yorkshire. We must take what we can find--and much can be found in Cornwall if we do not expect too much, nor look for what is not there, and under existing geological conditions could not be there. [Illustration: St Keyne's Well, Liskeard] =5. Watershed, Rivers.= From what has been already said, it will be seen that the great spinal column of Cornwall is in the north and that consequently the principal rivers must flow to the south. It is true that the Camel and its tributaries rise in the north and flow north to debouch into Padstow estuary, but that is the only river of the smallest consequence that directly feeds the Atlantic. [Illustration: On the Camel] The Camel rises in the wind-swept, sodden, clay land above Boscastle, and dribbles down to Camelford, passing under Slaughter Bridge and the stone of LATEINOS which traditionally mark the scene of King Arthur's last fight and death. After leaving Camelford, it plunges through a beautiful wooded valley, under Helsbury Castle occupying a bleak conical hill--a castle of the Dukes of Cornwall, but consisting only of a stone camp of prehistoric date and a ruined chapel in the midst dedicated to St Sith or Itha, an Irish saint. It passes Lavethan, a hospitium of the monks of Bodmin, and between wooded banks through Pencarrow and Dunmeer woods, and having run south, it now turns north to meet and mingle waters with the Allan, which has cleft for itself a very similar and equally beautiful valley. The Allan rises near the slate quarries of Delabole, and glides down by St Teath, and by St Mabyn on its bleak stormbeaten height, itself snug between beautiful hanging woods and with sweet old-world manor houses clustering near, and meets the Camel at Egloshayle. Thence they flow away into the Padstow estuary under the old 15th century bridge at Wadebridge, past the Camelot of legend--the only streams of any consequence that flow north.