In ch.22, I was surprised to see Sir Walter using "makeup" in its modern sense: "Morning visits are never fair by women at [LR's] time of life, who *make themselves up* so little. If she would only wear rouge she would not be afraid of being seen." I thought this definition of makeup was a 20th-century invention! BTW, when Sir Walter says "last time I called, I observed the blinds were let down immediately", does this mean they were let down while he was still at the door? Perhaps someone wasn't 100% enthusiastic about seeing *him*? ;-)
Later on, Charles Musgrove describes the change in Louisa: "If one happens only to shut the door a little hard, she starts and wriggles like a young dab-chick in the water." What's a dab-chick, I wonder - would that be a duckling?