Art. 67 OG; federal reform appeal in disputes below CHF 4,000; requirement of a motivated brief. Where the value in dispute does not reach the statutory threshold, the appellant must lodge, together with the declaration of appeal, a brief setting out the reasons. A mere reference to pleadings submitted before the cantonal instances does not satisfy this formal requirement and cannot cure the defect. Failure to comply renders the appeal inadmissible (consid. 1).