In this Act, unless the context otherwise requires, the expression " small debt court" shall mean the sheriff's small debt court, the expression " arrestment" shall include arrestment on the dependance, arrestment in security, and arrestment in execution, but shall not include arrestment to found jurisdiction; a law agent shall be deemed to be enrolled in a sheriffdom if his name is on the roll, kept in pursuance of section thirteen of the Law Agents (Scotland) Act, 1873, of law agents practising in any of the sheriff courts in that sheriffdom.