What is Jim's view of the hired girls and the town girls?
Jim finds the girls exciting, as do most of the "boys" that come from all around to fance at the Vannis' tent. The town girls, as Narrator Jim says, are not as exciting. The boys dance with them, but they are reserved, and don't seem to enjoy things as much as the hired girls do; the text says that the town girls' bodies struggle to keep up with the boys, and as a result, it's just one more reason that the boys and men flock to the immigrant girls.
Don't forget that you also have the suggestion of calling them "hired girls" that there is an implicit chance for sex, or at least heightened sexuality, with these girls. Even Jim, who doesn't exude much in the way of sexuality, talks about how he gets to kiss the hired girls all the time. Don't forget that the most important hired girl, Antonia, has a baby out of wedlock.