Autographs (To Preserve). The best plan to preserve autographs is to fix them in what is usually known as an invoice-book, in such a manner as to enable the collector to take them in and out at pleasure. The thin india-rubber thread may be used conveniently, running from corner to corner across the note or letter. The thread should be passed through a bit of card on the other side of the paper (to prevent the knot tearing the paper), and knotted. If the autographs are gummed or pasted, they cannot be removed without injury.