In this book I have made use of all the available sources, and have endeavoured to study the subject from the comparative point of view and in the light of the anthropological method. I have also interpreted the earlier cults by means of recent folk-survivals over the Celtic area wherever it has seemed legitimate to do so. The results are summarised in the introductory chapter of the work, and students of religion, and especially of Celtic religion, must judge how far they form a true interpretation of the earlier faith of our Celtic forefathers, much of which resembles primitive religion and folk-belief everywhere. Unfortunately no Celt left an account of his own religion, and we are left to our own interpretations, more or less valid, of the existing materials, and to the light shed on them by the comparative study of religions. As this book was written during a long residence in the Isle of Skye, where the old language of the people still survives, and where the _genius loci_ speaks everywhere of things remote and strange, it may have been easier to attempt to realise the ancient religion there than in a busier or more prosaic place. Yet at every point I have felt how much would have been gained could an old Celt or Druid have revisited his former haunts, and permitted me to question him on a hundred matters which must remain obscure. But this, alas, might not be! I have to thank Miss Turner and Miss Annie Gilchrist for valuable help rendered in the work of research, and the London Library for obtaining for me several works not already in its possession. Its stores are an invaluable aid to all students working at a distance from libraries. J.A. MACCULLOCH. THE RECTORY, BRIDGE OF ALLAN, _October_ 1911. FOOTNOTES: [1] See also my article "Celts" in Hastings' _Encyclopædia of Religion and Ethics_, vol. iii. [TRANSCRIBER'S NOTE: Throughout this book, some characters are used which are not part of the Latin-1 character set used in this e-book. The string "[^y]" is used to represent a lower-case "Y" with a circumflex mark on top of it, "[=a]" is used to represent a lower-case "A" with a line on top of it, and "[oe]" is used to represent the "oe"-ligature. Numbers in braces such as "{3}" are used to represent the superscription of numbers, which was used in the book to give edition numbers to books.] CONTENTS CHAP. PAGE