About half a mile to the right of the high road stands an object of later origin, but not of less interest to the antiquary; the ruins of a small oratory, or baptistry, dedicated to _Saint Euinus_, and commonly known by the name of _Chapel Euny_. It is situated near a well, whose waters have been long supposed to possess very extraordinary virtues, and to have performed many miraculous cures. There is a similar ruin, which we shall hereafter have occasion to notice at Madron; and it is worthy of remark that these wells do not possess any mineral impregnation; the sick, however, at this very day, repair to them, while the credulous attempt to read the future in the appearance of the bubbles produced in their waters by the dropping in of pins or pebbles. This mode of divining is perhaps one of the most ancient superstitions that have descended to us, and was termed _Hydromancy_. The Castalian fountain, and many others amongst the Grecians, were supposed to be of a prophetic nature; thus, by dipping a fair mirror into a well did the Patræans of Greece receive, as they vainly imagined, some notice of ensuing sickness, or convalescence. On the summit of the hill above these ruins, are situated the remains of _Caerbran Castle_ or Round (that is _Brennus's Castle_) which is thus described by _Borlase_. "It is a circular fortification, consisting first of a deep ditch, fifteen feet wide, edged with stone, through which you pass to the outer _vallum_, which is of earth, fifteen feet high, and was well perfected towards the north-east, but not so towards the west; within this vallum, passing a large ditch about fifteen yards wide, you come to a stone wall, which quite rounded the top of the hill, and seems to have been of considerable strength, but lies, now, like a ridge of disorderly stones; the diameter of the whole is ninety paces, and in the centre of all is a little circle." There are no less than seven of these _hill castles_, as they are termed, although they might with more propriety be called strong entrenchments, to be seen at this time within five miles around Penzance; all so placed on the hills as to admit of immediate communication with each other by signal. From several of them we have views of the North and South Channel, but from all of them either that of one sea or the other. Much doubt has arisen concerning their origin. _Mr. Polwhele_ attributes them to the Irish, while _Dr. Borlase_, like an orthodox antiquary, who takes shelter, whenever he is bewildered, under the sanction of a popular name, at once boldly decides upon their Danish origin.