Sentence:  Let us suppose a person blind and deaf from his birth, who being grown to man's estate, is by the Dead-palsy, or some other cause, deprived of his Feeling, Tasting, and Smelling; and at the same time has the <WSD>impediment</WSD> of his Hearing removed, and the film taken from his eyes ... 
Meaning of the word marked with <WSD> tags:  A disability, especially one affecting the hearing or speech.