Both Uses of

rustic
in
The Mill on the Floss

But Philip's self-taught skill in drawing was another link between them; for Tom found, to his disgust, that his new drawing-master gave him no dogs and donkeys to draw, but brooks and rustic bridges and ruins, all with a general softness of black-lead surface, indicating that nature, if anything, was rather satiny; and as Tom's feeling for the picturesque in landscape was at present quite latent, it is not surprising that Mr. Goodrich's productions seemed to him an uninteresting form of art.†
Chpt 2.4

But at last it was the turn of the good old-fashioned dance which has the least of vanity and the most of merriment in it, and Maggie quite forgot her troublous life in a childlike enjoyment of that half-rustic rhythm which seems to banish pretentious etiquette.†
Chpt 6.10 *

Definition:

characteristic of rural life; simple without refined touches