Art. 45 OG; complaints concerning non-execution of a Federal Court judgment by a canton are not cognizable by the Federal Court but must be addressed to the Federal Council. Art. 19 Abs. 2 SchKG; a complaint alleging delay in bankruptcy administration is admissible before the Federal Court only if it alleges a denial of justice or undue delay attributable to the cantonal supervisory authority; where the grievance concerns the bankruptcy office itself, the cantonal supervisory remedy must be exhausted first. The Court lacks competence ex officio in such matters.