A practical look at the Practical Science of Printing

In 1723, a Frenchman named Martin-Dominque Fertel published a book on printing, La science pratique de l’imprimerie. It’s good to look at early printing manuals, especially when one is trying to understand how early printing works, so I was delighted to learn that the Folger acquired a copy of the book from the Veatchs in September 2012. When I called the book up from the vaults, I saw that it was housed in a specially-made case: But why was the book in a box?