Barbara was fond enough of algebra, but it seemed droll that Mason, with an unsettled proposition of marriage on hand, should revert to his favorite study. She could not see what he was writing, but when he passed the slate to her, she read:

a = another lover.
b = objections to H. Mason.
c = interfering circumstances.
x = a + b + c.

"Now," said Mason, when she looked up, "I'd like you to help me to get the exact value of x in this little equation. It's a kind of fortune-telling by algebra. We must proceed by elimination; you may strike out such of the letters on the right side of the last equation as do not count for anything."

But instead of proceeding as the master suggested, Barbara, whose reserve was partly dissipated by her amusement, took the pencil that he offered her, and after a moment's reflection wrote below:

a = 0
b = 0
x = c

"I never saw an equation more to my taste," said Hiram. "If it's only circumstances, then circumstances and I are going to fight it out. You think there are things that will keep us from making an equation between Barbara and Hiram?"

"There wouldn't be any equation," she said, looking out of half-closed eye-lids, as she always did when speaking with feeling. "Your family is an educated one, and your father and mother wouldn't approve of us. Mother never had any chance to learn, and her talk is very old-fashioned, but she's just as good as good can be, all the same. Tom's unsteady; I hope he'll get over that yet; but your father and mother and your sisters wouldn't like it."

"Yes, they would, if they knew you," said Mason, with enthusiasm; "and, besides, I don't see that I'm bound to get their consent."

"But that wouldn't change matters," persisted Barbara, despondingly. "If they didn't like it, it wouldn't be nice."

"Don't you bother about my happiness, Barbara. If I have you, do you think anything else will trouble me?" He got up and snuffed the candle with his fingers like the brave man that he was.