Edward Davies 
Celtic Researches, on the Origin, Traditions Language, of the Ancient Britons [PDF ebook] 
With Some Introductory Sketches, on Primitive Society

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The occult, and mystic lore of, Druidism, though containing principles of inestimable value in the elements of language, was neither intended, nor calculated.