Northern Rhodesia Crown Lands and Native Reserves (Tanganyika District) Order in Council, 1929, Article 3 (6)- natives resident outside a native reserve not to be permitted to so remain after certain period- natives so remaining in contravention of Article 3 (6)- conviction for disobedience under Penal Code section 107- conviction quashed on review- Article 3 (6) held to be directory only.