He had, however, published books on several other subjects, including an exhaustive study of barnacles, both living and extinct.

（然而，在其他领域他出版了好几本书，其中包括关于现存的以及灭绝的藤壶的详尽研究）之后，在那年的六月，达尔文收了一个名叫阿尔弗莱德.鲁塞尔.华莱士的年轻人的包裹。

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Most books are intended to be easily read and understood, and the oldest ones can often serve as windows into long-extinct cultures and ways of life.

大多数的书都容易阅读、理解，而古老的书籍则是认识早已灭绝的文化和生活方式的一扇窗。

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