Read it through once

Now, I perceived he was not looking at the wall; for when I regarded him alone, it seemed exactly that he gazed at something within two yards’ distance. And whatever it was, it communicated, apparently, both pleasure and pain in exquisite extremes: at least the anguished, yet raptured, expression of his countenance suggested that idea. The fancied object was not fixed, either: his eyes pursued it with unwearied diligence, and, even in speaking to me, were never weaned away. I vainly reminded him of his protracted abstinence from food: if he stirred to touch anything in compliance with my entreaties, if he stretched his hand out to get a piece of bread, his fingers clenched before they reached it, and remained on the table, forgetful of their aim.