Wooden Books and Butterfly Wings.

The article discusses the practice of incorporating actual specimens into books on natural history. It highlights examples of books that used this technique, such as those that attached butterfly wing scales to pages or included pressed specimens of seaweed and algae. The article also mentions the creation of wooden "libraries" that documented trees by using different parts of the tree as the covers and contents of the books. These specimen-based collections required significant time and effort to create and are now highly valued artifacts. [Extracted from the article]