“ Citation was served by delivering a copy to the attorney general of the state of Florida. The attorneys who represented the defendant in the state courts, acting as friends of the court, have placed upon the files evidence establishing that A. C. Croom died on February 7, 1912, and that William V. Knott was thereafter appointed and duly qualified as comptroller of the state of Florida, and has been acting as such since February 17, 1912. ”