This is a duplication of a book released prior to 1923. This publication might have occasional flaws such as missing out on or obscured pages, bad pictures, wayward marks, etc. that were either part of the original artefact, or were introduced by the scanning procedure. Our company believe this job is culturally essential, and despite the infirmities, have actually chosen to bring it back into print as part of our continuing dedication to the conservation of published jobs worldwide. We value your understanding of the flaws in the conservation process, and hope you enjoy this important publication.