Extradition — Conditions of — Requirement that act charged be punishable in both States — Nature of offence — Whether required to be identically defined — Effect of general amnesty in requesting State — Effect of statutes of limitation — Principle of specialty — Whether required to be expressly safeguarded — Interpretation of extradition treaty by reference to travaux préparatoires — Extradition Treaty between Italy and Switzerland, 1868 — The law of Switzerland.