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. Translated from the French with the authority and assistance of the Author. The author has, at the request of the publishers, considerably enlarged the work for the translator, and has added the literature of the subject to date the translation may, therefore, be looked upon as an equivalent of a new and improved edition of the original.