In Sherlock Holmes, what suggests that Watson has an expert in understanding of the habits of Holmes?

Explanation:

The two lines above show that Watson had become an expert in studying Holmes. In the first, Watson himself, admits that he knows every mood and habit of Holmes and how they told their own stories. He was able to deduce from them that Holmes was working again.

In the second line, Watson was able to deduce that Holmes was glad to see him even though his manner was not revealing this.

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wheres the passage with the idiom underlined