What does plus and minus mean in

What does plus and minus mean in Oh! what agony I endured. Elgin was about to answer when he caught a gasp from the watchers on the road. "Teacher's comin'!" went forth the cry.,Till all the landscape sinks into the shade.,"If he claims my wife for another dance, I'll——" begins Geoffrey.,Patricia was silent, weighing this suggestion. They both broke into negation at once as they reached their own front door.,Sarby flushed and drew back with cold reserve.，“Singe my hair ef I do, let’s hev some more doin’s,” rebelled Moses.，And Mona had marked his embarrassment, and had quickly, with all the vivacity that belongs to her race, drawn her own conclusions therefrom, which were for the most part correct.，Judith tossed her head, with a little giggle at her own expense."David!" ejaculated Maurice, in an astonished tone. "You wish Isabella to marry him?"

"In a word," interrupted Jen, "this black witch had hypnotized Mrs. Dallas.",And Billy, suddenly remembering who was being cheered, slid to his seat sheepishly, a cold feeling down his back, uncomfortable heat in his cheeks.,But while Dido goes on her dark path and takes her way toward Etwald in his gloomy house at Deanminster, it is necessary to return to the doings of Major Jen. On leaving The Wigwam he returned forthwith to his own house with the intention of repeating to David the conversation which had taken place between himself. Dido and Isabella. On his arrival, however, he learned that David had gone out for a walk, and that Lady Meg Brance was waiting for him in the library. At once the ever-courteous major hastened to apologize to his visitor.,Morning Star would not listen. He ran toward the water and Scarface ran after him, for he knew that he must kill the birds and save the boy's life. He ran ahead of Morning Star and met the birds, which were coming to fight, and killed every one of them with his spear; not one was left. The young men cut off the heads of the birds and carried them home, and when Morning Star's mother heard what they had done, and they showed her the birds' heads, she was glad. She cried over the two young men and called Scarface "My son," and when the Sun came home at night she told him about it, and he too was glad.,"Yet even were it so you would love me, Mona?",MORAL,"I say no, Tom," the other returned, surlily. "It won't be safe there. Somebody'll be sure to find it.",“Come here, boy,” called a very stout gentleman, the cross merchant who owned the “Sea Mew.”,And play the prelude of our fate.","Keep quiet till they get past," cautioned Billy. "Say! we needn't have been so blamed careful about makin' our sneak if we'd knowed your Pa was away from home.",“Light transit,” said Jerry. “We will need it to make sure that a road into the canyon is possible. What might seem quite possible to the eye, is often no use at all. I thought we’d better make sure.”,"Pray for me," he says..