The only question is whether there was error prejudicial to the defendant in the exclusion of the question put to Bassett as to the value of the extra work done by the plaintiff.

The bill of exceptions fails to show what the answer would have been, or what the defendant offered or expected to prove by it. We cannot say, therefore, that the defendant has been harmed by the exclusion of the question. Farnum v. Pitcher, 151 Mass. 470.

Fxceptions overruled.