Not quite as old, but I've an 1888-published (but
ninth-edition) chemistry textbook. It's in not-too-good condition
1, but almost all the damage was already there before I obtained it as it is not visibly worse than when I first took it into my possession, maybe three decades ago. It's been sat in a bookshelf for quite a long time with no special handling applied to it.
An interesting read. Despite being post-Mendeleev (1871 being the key date involved) it has no actual periodic table of either Mendeleevian 'classic' or (naturally) post-Mendeleev 'standard' forms. There's a list-table of elements (alphabetical!) with... <counts> ...a total of 64 listed thus. But one of
those is Didymium, which had as early as 1875 turned out to be actually a mixture of the then-unknown elements Praseodymium and Neodymium, so I'm not sure how up-to-date the ninth version actually ended up being...
But for a long time I've really been meaning to bravely set about scanning it, though, whilst carefully not increasing its dilapidation through the increased handling, or at least checking to see whether it is already represented in Project Gutenberg or similar (and, if not, having greater impetus to scan it and then submitting it).
1 Some may be from its time in the schoolroom in its first few decades of actual use (there's ink stains on the cover), but it also gotten damp at some point. Perhaps whilst sat on the lab desks, but could just as well have been at some time during maybe the second half-century of its existence (severe water damage to the cover and leached into the edges of some of the outer pages, although the spine itself is mostly sound and intact right now with all pages still attached) when it was sitting around being unloved for reasons
other than being in a classroom.