In civil causes when the jury, or as many as ten of them, have agreed upon a verdict, they must be conducted into court, their names called by the clerk, and the verdict rendered by their foreman; the verdict must be in writing, signed by the foreman, and must be read by the clerk to the jury, and the inquiry made whether it is their verdict. Either party may require the jury to be polled, which is done by the court or clerk asking each juror if it is his verdict; if upon such inquiry or polling, more than two of the jurors disagree thereto, the jury must be sent out again, but if no such disagreement be expressed, the verdict is complete and the jury discharged from the case.