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Before proceeding to examine our second point, which is whether the Grail itself really belongs to the original form of the Quest, or has been introduced into the Quest versions from the Early History, it will be advisable to summarise the opinions and researches of previous investigators. Light will thus be thrown upon many points of interest which have not received special examination in these pages. A theory of the origin and development of the cycle, which is in many respects directly opposed to the conclusions we have reached, will also be fully set forth, and an opportunity will thus be given for testing by adverse criticism the soundness of our method of investigation, and of the results to which it has led us.