Basil of Baker Street -- His Limits

In A Study in Scarlet, Dr. Watson creates a list elaborating his assessment of the knowledge of Sherlock Holmes on various subjects. If Dr. Dawson created such a list about his associate, Basil of Baker Street, it might read something like this:

Knowledge of Philosophy.--Nil.

Politics.--Nil.

Literature.--Limited.
Appears to recall every word of every book he has ever read, but his tastes are very specefic.

Geography.--Feeble.
Possesses intimate knowledge of London and its environs, but little else.

Higher Mathematics.--Astonishing.
Can work out the most abstruse calculations entirely in his head. More...