Art. 35, Art. 46 expropriation statute; security deposit and appeal rights in expropriation proceedings: the right to complain against a valuation commission decision is independent of the duty to furnish security and cannot be made to lapse for non-compliance with the security order. The security serves only to permit immediate commencement of works on the expropriated property. If security has already been given, the legal consequences of that circumstance and any additional security requirement are for the Federal Council to determine under Art. 46 para. 2; execution of valuation commission decisions likewise belongs to it, not to the Federal Court (consid. 1-2).