October 3, 1896, Lord Carysfort wrote: "A few of my books which were in cases were quite preserved from serious injury, the cases having been blackened and destroyed, while the book and its binding were scarcely discoloured. Since the fire I have had all my valuable books put into cases such as you make."
These circumstances having accidentally become known to the writer, he thought it his duty to test Mr. Zaehnsdorf's cases for himself. Two of these, filled with printed papers of no value, were placed (April 1897) on a very hot fire in the writer's own study, in the presence of Mr. Zaehnsdorf and several officers of the library of the British Museum. The result was highly satisfactory. Though the cases were greatly damaged, the papers received very little injury, and this only when they were in actual contact with the bottom and sides of the cases. Had they been bound volumes, nothing would have suffered except the edges of the binding.
It seems evident that Mr. Zaehnsdorf's invention well deserves the attention of wealthy collectors of precious books. There is a serious obstacle to its introduction on an extensive scale into great libraries from the expense of the cases, which at present average about a pound a piece. It is probable, however, that cases could be contrived to take books by the shelf-ful instead of single volumes. In any event, however, it would be well worth while to employ them for the protection of books of extreme rarity and inestimable manuscripts, as well as the archives of great libraries, and artistic
