'Tis known by the name of perseverance in a good cause,—AND

'Tis known by the name of perseverance in a good cause,—AND of obstinacy in a bad one
['Tis ]部分是否印刷错误啊,应该是什么?
是错误还是缩写啊，请回答

简写,不是印刷错误,
'Tis= It is