Treaties — Conclusion and operation of — Constitutional limitations — Head of State required to conclude treaties — International Agreement concluded by departmental Minister — Validity of Agreement — Validity of municipal law enacted in pursuance of Agreement — The law of Luxembourg.

Treaties — Special kinds of — Treaty establishing Economic Union — Belgo-Luxembourg Treaty of July 25, 1921 — Subsequent Agreement between Belgium, Luxembourg and Netherlands restricting imports — Compatibility of Agreement with Treaty on Economic Union — The law of Luxembourg.