“Because my brother Mycroft possesses it in a larger degree than I do.”

This was news to me indeed. If there were another man with such singular powers in England, how was it that neither police nor public had heard of him? I put the question, with a hint that it was my companion’s modesty which made him acknowledge his brother as his superior. Holmes laughed at my suggestion.

“My dear Watson,” said he, “I cannot agree with those who rank modesty among the virtues. To the logician all things should be seen exactly as they are, and to underestimate one’s self is as much a departure from truth as to exaggerate one’s own powers. When I say, therefore, that Mycroft has better powers of observation than I, you may take it that I am speaking the exact and literal truth.”

“Is he your junior?”

“Seven years my senior.”

“How comes it that he is unknown?”