The court to which the doings of such jury are returned may set the same aside if, upon exception taken, it appears to said court that such jury has been improperly summoned or has conducted improperly; otherwise such doings shall be conclusive. If the court sets aside the report of the jury, it shall order another jury to reestimate such damages and benefits in the manner aforesaid; and, if the clerk finds, after he has drawn the names of such jurors from the boxes, that any of them is disqualified, he shall release such as are disqualified and return their names into the box whence they were drawn and summon others, who are indifferent, to supply their places.