These books may contain language and attitudes considered offensive by the modern day. For the sake of historical accuracy and research value, the decision has been made to present them unaltered.

In the same way, the scientific and historical content is that which was believed at the time of the book’s publication, and therefore should not be used for modern scientific research.

Copyright

Some books may be out of copyright in one country and not another due to varying copyright laws. Those books are blocked to visitors in the country where the book is not out of copyright, and we supply a note where that is the situation.

Read Online

The Read Online versions may not preserve original formatting due to the constraints of HTML. They will be as accurate as we can get them. Infolinks are used both to help support the site and to make it easier to track site scrapers: the books are free in PDF after all!