This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.

This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.

As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

这部作品已被学者们选为具有重要的文化意义，是我们所知的文明知识库的一部分。这部作品是根据原始文物复制的，并尽可能地保持了对原始作品的真实性。因此，你会看到原来的版权参考、图书馆印章（因为这些作品大多被存放在我们世界各地最重要的图书馆），以及作品中的其他注解。

这部作品在美国以及可能在其他国家属于公共领域。在美国境内，你可以自由复制和传播这部作品，因为没有任何实体（个人或公司）对作品的主体拥有版权。

作为历史文物的复制品，该作品可能包含缺失或模糊的页面、糟糕的图片、错误的标记等。学者们认为，而且我们也同意，这部作品的重要性足以让我们保存、复制并向公众开放。我们感谢你对保存过程的支持，并感谢你成为保持这一知识的活力和相关性的重要组成部分。