Can you guess who it is?

I'm going to describe someone to you, it's a famous fictional character...



He was quiet in his ways, and his habits were regular. It was rare for him to be up past ten at night, and he had invariably breakfasted and gone out before most rose in the morning. Sometimes he spent his day at the chemical laboratory, sometimes in the dissecting rooms, and occasionally in long walks, which appeared to take him into the lowest portions of the city. Nothing could exceed his energy when the working fit was upon him; but now and again a reaction would seize him, and for days on end he would lie upon the sofa in the sitting-room, hardly uttering a word or moving a muscle from morning to night. On these occasions I have noticed such a dreamy, vacant expression in his eyes, the I might have suspected him of being addicted to the use of some narcotic, had not the temperance and cleanliness of his whole life forbidden such a notion...

His very person and appearance were such as to strike the attention of the most casual observer. In height he was rather over six feet, and so excessively lean that he seemed to be considerably taller. His eyes were grey, sharp and piercing, save during those intervals of torpor to which I have alluded; and his thin hawk-like nose gave his whole expression an air of alertness and decision. His chin, too, had the prominence and the squareness which marked the man of determination. His hands were invaribly blotted with ink and stained with chemicals, yet he was possessed of extraordinary delicacy of touch, as I frequently had occasion to observe when I watched him manipulating his fragile philosophical instruments.

Tell me who you think it is... I'll tell you if you can't guess of course -^____^-

~Otenba