--The laws of nature will defend themselves; --but error----(he would add, looking earnestly at my mother)----error, Sir, creeps in thro' the minute holes and small crevices which human nature leaves unguarded.

 - the laws of nature will defend themselves - but error' (he would add, looking earnestly at my mother) - 'error creeps in through the minute holes and crevices which human nature leaves unguarded.'
