From hence riding along the hare-warren and end of the park, we are entertained with the landscape of no less than five rivers, four retaining the old British names: the villages on each side of them are so thick, that they seem to join and form long cities in woods. About the union of these rivers are three cities and three cathedrals within a triangle, whose sides are less than three miles; Wilton, Old and New Sarum. The _Nadre_ signifies a snake or adder, metaphorically drawn from its winding current: it rises by the end of the Ten-mile course above described, and passes by a pleasant village belonging to your lordship, Chilmark, famous for its quarries; of a very good stone, white, and that rises in any dimensions: there is now a single stone, lying over the mouth of the quarry like an architrave, full sixty foot long, twelve foot thick, and, as the workmen have assured me upon examination, perfectly without flaw: sometimes here are found great petrified oyster-shells. The Willy rises about Warminster, taking in a little brook, the Dyver, passing under ground, runs by Yarnbury, a vast Roman camp, where some think is Vespasian’s name; a great semi-circular work at the entrance: several Roman coins have been found here. Not far off is a ditch called Chiltern, which seems to be some division of the hundreds. There is another camp on the other side the Willy: then it runs by Grovely, a great wood of your lordship’s: it admits another stream coming on the west side of Stonehenge from Orcheston, remarkable for a long kind of grass, which without good proof I should scruple relating, for it is commonly twenty-five foot in length, much coveted by cattle; by Mr. Ray called _gramen caninum supinum longissimum_: he says they use to fatten hogs with it. This Willy, that gives name to Wilton, passes chiefly on the north side of the town, makes the canal before the front of the house, and then joins the Nadre, coming on the south side of the town and through the gardens, at the end of the avenue. The Avon arises from under the great ridge of hills that divides Wiltshire into north and south, crowned with the Wansditch: it passes southward through innumerable villages to Ambsbury, the _pagus Ambri_ famous for a monastery built by one Ambrus, which the monks and fabulous writers have wrested into _Ambrosbury_; then for a celebrated nunnery of noble-women, great numbers of whom, against the institution of Nature and Providence, were here veiled: it is now the seat of my lord Charlton, built by Inigo Jones, and deservedly to be admired: some new works are added to it under the direction of my lord Burlington, possessor of his spirit, and a noble collection of his designs. The famous old city of _Sorbiodunum_ may be said to stand upon this river: it meets with the other two just before it passes through Salisbury, and beyond it receives the Bourn, which has dropped its proper name: but I guess it to have been _Colin_ or _Colinity_, the same as _Clun_;