Such petition shall state briefly the nature of the proceeding before the commission, and shall set forth the order or decision complained of, and the grounds upon which the same is claimed to be unlawful or unreasonable upon which the petitioner will rely in the supreme court.
RSA 541:7
1913, 145:18. PL 239 :5. 1937, 107:18; 133:79. RL 414:7.