This section is from the book "Ancient Legends, Mystic Charms, And Superstitions Of Ireland", by Jane Francesca Wilde. Also available from Amazon: Ancient Legends, Mystic Charms, And Superstitions Of Ireland.
If a healthy child suddenly droops and withers, that child is fairy-struck, and a fairy doctor must be at once called in. Young girls also, who fall into rapid decline, are said to be fairy-struck ; for they are wanted in Fairy-land as brides for some chief or prince, and so they pine away without visible cause till they die.
The other malign influences that act fatally on life are the Wind and the Evil Eye. The evil power of the Wind is called a fairy-blast; while, of one suffering from the Evil Eye, they say he has been " overlooked."
The fairy doctor must pronounce from which of these three causes the patient is suffering. The fairy-stroke, or the fairy-blast, or the Evil Eye ; but he must take no money for the opinion given. He is paid in some other way ; by free gracious offerings in gratitude for help given.
A person who visited a great fairy doctor for advice, thus describes the process of cure at the interview :-
" The doctor always seems as if expecting you, and had full knowledge of your coming. He bids you be seated, and after looking fixedly on your face for some moments, his proceedings begin. He takes three rods of witch hazel, each three inches long, and marks them separately, ' For the Stroke,' ' For the Wind,' « For the Evil Eye.' This is to ascertain from which of these three evils you suffer. He then takes off his coat, shoes, and stockings ; rolls up his shirt sleeves, and stands with his face to the sun in earnest prayer. After prayer he takes a dish of pure water and sets it by the fire, then kneeling down, he puts the three hazel rods he had marked into the fire, and leaves them there till they are burned black as charcoal. All the time his prayers are unceasing; and when the sticks are burned, he rises, and again faces the sun in silent prayer, standing with his eyes uplifted and hands crossed. After this he draws a circle on the floor with the end of one of the burned sticks, within which circle he stands, the dish of pure water beside him. Into this he flings the three hazel rods, and watches the result earnestly. The moment one sinks he addresses a prayer to the sun, and taking the rod out of the water he declares by what agency the patient is afflicted. Then he grinds the rod to powder, puts it in a bottle which he fills up with water from the dish, utters an incantation or prayer over it, in a low voice, with clasped hands held over the bottle. But what the words of the prayer are no one knows, they are kept as solemn mysteries, and have been handed down from father to son through many generations, from the most ancient times. The potion is then given to be carried home, and drunk that night at midnight in silence and alone. Great care must be taken that the bottle never touches the ground ; and the person carrying it must speak no word, and never look round till home is reached. The other two sticks he buries in the earth in some place unseen and unknown. If none of the three sticks sink in the water, then he uses herbs as a cure. Vervain, eyebright, and yarrow are favourite remedies, and all have powerful properties known to the adept ; but the words and prayers he utters oven them are kept secret, and whether they are good or bad¿ or addressed to Deity or to a demon, none but himself can tell."
These are the visible mysteries of the fairy doctor while working out his charms and incantations. But other fairy doctors only perform the mysteries in private, and allow no one to see their mode of operation or witness the acts of prayers.
If a potion is made up of herbs it must be paid for in silver ; but charms and incantations are never paid for, or they would lose their power. A present, however, may be accepted as an offering of gratitude.
 
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Irish, Ireland, superstitions, charms, legends, cures, fairy