ABOUT the same time the venerable man, from motives of humanity, besought Broichan the Druid to liberate a certain Scotic female slave, and when he very cruelly and obstinately refused to part with her, the saint then spoke to him to the following effect: ‘Know, O Broichan, and be assured that if thou refuse to set this captive free, as I desire thee, that thou shalt die suddenly before I take my departure again from this province.’ Having said this in presence of Brude, the king, he departed from the royal palace and proceeded to the river Nesa (the Ness); from this stream he took a white pebble, and showing it to his companions said to them: ‘Behold this white pebble by which God will effect the cure of many diseases among this heathen nation.’ Having thus spoken, he instantly added, ‘Broichan is chastised grievously at this moment, for an angel being sent from heaven, and striking him severely, hath broken into many pieces the glass cup in his hand from which he was drinking, and hath left him gasping deeply for breath, and half dead. Let us await here a short time, for two of the king's messengers, who have been sent after us in haste, to request us to return quickly and help the dying Broichan, who, now that he is thus terribly punished, consenteth to set the girl free.’ Whilst the saint was yet speaking, behold, there arrived, as he had predicted, two horsemen who were sent by the king, and who related all that had occurred to Broichan in the royal fortress, according to the prediction of the saint—both the breaking of the drinking goblet, the punishment of the Druid, and his willingness to set his captive at liberty; they then added: ‘The king and his friends have sent us to thee to request that thou wouldst cure his foster-father Broichan, who lieth in a dying state.’ Having heard these words of the messengers, St. Columba sent two of his companions to the king with the pebble which he had blessed, and said to them: ‘If Broichan shall first promise to set the maiden free, then at once immerse this little stone in water, and let him drink from it and he shall be instantly cured; but if he break his vow and refuse to liberate her, he shall die that instant.’ The two persons, in obedience to the saint's instructions, proceeded to the palace, and announced to the king the words of the venerable man. When they were made known to the king and his tutor Broichan, they were so dismayed that they immediately liberated the captive and delivered her to the saint's messengers. The pebble was then immersed in water, and in a wonderful manner, contrary to the laws of nature, the stone floated on the water like a nut or an apple, nor, as it had been blessed by the holy man, could it be submerged. Broichan drank from the stone as it floated on the water, and instantly returning from the verge of death recovered his perfect health and soundness of body. This remarkable pebble, which was afterwards preserved among the treasures of the king, through the mercy of God effected the cure of sundry diseases among the people, while it in the same manner floated when dipped in water. And what is very wonderful, when this same stone was sought for by those sick persons whose term of life had arrived, it could not be found. Thus, on the very day on which King Brude died, though it was sought for, yet it could not be found in the place where it had been previously laid.