Holmes was certainly not a difficult man to live with.
He was quiet in his ways, and his habits were regular.
It was rare for him to be up after ten at night, and he had
invariably breakfasted and gone out before I 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,
that 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.

As the weeks went by, my interest in him and my curiosity
as to his aims in life, gradually deepened and increased.
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 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 squareness which mark the man of determination. His hands
were invariably blotted with ink and stained with chemicals,
yet he was possessed of extraordinary delicacy of touch,