This book was originally published prior to 1923, and represents a reproduction of an important historical work, maintaining the same format as the original work. While some publishers have opted to apply OCR (optical character recognition) technology to the process, we believe this leads to sub-optimal results (frequent typographical errors, strange characters and confusing formatting) and does not adequately preserve the historical character of the original artifact. We believe this work is culturally important in its original archival form. While we strive to adequately clean and digitally enhance the original work, there are occasionally instances where imperfections such as blurred or missing pages, poor pictures or errant marks may have been introduced due to either the quality of the original work or the scanning process itself. Despite these occasional imperfections, we have brought it back into print as part of our ongoing global book preservation commitment, providing customers with access to the best possible historical reprints. We appreciate your understanding of these occasional imperfections, and sincerely hope you enjoy seeing the book in a format as close as possible to that intended by the original publisher.

本书最初出版于1923年之前，是一部重要历史作品的复制品，保持了与原作相同的格式。虽然一些出版商选择将OCR（光学字符识别）技术应用到这一过程中，但我们认为这导致了次优的结果（频繁的排版错误、奇怪的字符和混乱的格式），并没有充分保留原始艺术品的历史特征。我们相信这项工作以其原始的档案形式具有文化上的重要性。虽然我们努力对原始作品进行适当的清理和数字增强，但偶尔也会出现一些不完美的地方，如模糊或缺失的页面、糟糕的图片或错误的标记，这可能是由于原始作品的质量或扫描过程本身所造成的。尽管有这些偶尔的不完美之处，我们还是把它重新印刷出来，作为我们正在进行的全球图书保护承诺的一部分，为客户提供尽可能好的历史重印本。我们感谢你对这些偶尔的不完美的理解，并真诚地希望你喜欢看到这本书的格式尽可能地接近原出版商的意图。