Agree with Jim 1870s, but the rest of the scene is quite a bit earlier...the blank backdrop and the out-of-focus rug. The photographer must have been a bit behind the times. Or maybe a bit earlier in the decade? The dress and the chair are definitely 70s, so possibly more mid than late? Rounded corners came out in around 1875ish.
Can you imagine how much cat hair the fringe on the chair could collect?

I've been staring at this for a while looking for a hand holding the book but don't see one. The girl's sleeves are quite frilly and that might be what Jim's seeing.
Or perhaps he's left his specs on the nightstand again. Next to the glass with the teeth in it.
Hiya Jim

Cheers,
China