In Act 1, what is Colonel Pickering's claim to fame? What does the Note Taker say he is and what did he write?

Colonel
Pickering (The Gentleman) we learn is the author of the book Spoken
Sanscrit.    Pickering is a linguist of such great
renown that Higgins was on the way to India to meet him.  Pickering was also in search of
Higgins, who is a phoneticist (a...