Each medical family kept a book, which was handed down reverently from father to son, and in which was written, in Irish or Latin, all the medical knowledge derived either from other books or from the actual experience of the various members of the family; and many of these old volumes, all in beautiful handwriting, are still preserved in Dublin and elsewhere. As showing the admirable spirit in which those good men studied and practised their profession, and how much they loved it, it is worth while to give a translation of the opening statement, a sort of preface, in the Irish language, written at the beginning of one of these books, nearly six hundred years ago:-- “May the good God have mercy on us all. I have here collected practical rules of medicine from several works, for the honour of God, for the benefit of the Irish people, for the instruction of my pupils, and for the love of my friends and of my kindred. I have translated many of them into Gaelic from Latin books, containing the lore of the great leeches of Greece and Rome. These are sweet and profitable things which have been often tested by us and by our instructors. “I pray God to bless those doctors who will use this book; and I lay it as an injunction on their souls, that they extract knowledge from it not by any means sparingly, and that they do not neglect the practical rules herein contained. More especially I charge them that they do their duty devotedly in cases where they receive no payment on account of the poverty of their patients. “Let every physician, before he begins his treatment, offer up a secret prayer for the sick person, and implore the heavenly Father, the Physician and Balm-giver of all mankind, to prosper the work he is entering upon, and to save himself and his patient from failure.” There is good reason to believe that the noble and kindly sentiments here expressed were generally those of the physicians of the time; from which we may see that the old Irish medical doctors were quite as devoted to their profession, as eager for knowledge, and as anxious about their patients as those of the present day. The fame of the Irish physicians reached the Continent. Even at a comparatively late time, about three hundred years ago, when medicine had been successfully studied and practised in Ireland for more than a thousand years, Van Helmont, a well-known and distinguished physician of Brussels, in a book written by him in Latin on medical subjects, praises the Irish doctors, and describes them correctly as follows:--