文档介绍：This is a digital copy of a book that was preserved for generations on library shelves before it was carefully scanned by Google as part of a projectto make the world’s books discoverable has survived long enough for the copyright to expire and the book to enter the public domain. Apublic domain book is one that was never subjectto copyright or whose legal copyright term has expired. Whether a book is in the public domain may vary country to country. Public domain booksare our gateways to the past, representing a wealth of history, culture and knowledge that’s often dif?cult to , notations and other marginalia present in the original volume will appear in this ?le - a reminder of this book’s long journey from thepublisher to a library and ?nally to guidelinesGoogle is proud to partner with libraries to digitize public domain materials and make them widely accessible. Public domain books belong to thepublic and we are merely their custodians. Nevertheless, this work is expensive, so in order to keep providing this resource, we have taken steps toprevent abuse mercial parties, including placing technical restrictions on automated also ask that you:+Make mercial use of the ?lesWe designed Google Book Search for use by individuals, and we request that you use these ?les forpersonal, mercial purposes.+Refrain from automated queryingDo not send automated queries of any sort to Google’s system: If you are conducting research on ranslation, optical character recognition or other areas where access to a large amount of text is helpful, please contact us. We encourage theuse of public domain materials for these purposes and may be able to help.+Maintain attributionThe Google “watermark” you see on each ?le is essential for informing people about this project and helping them ?ndadditional materials through Google Book Search. Please do not remove it.+Keep it legalWhatever your use, remember that you are responsible for ensuring th