Sumerian language
Waddell's Sumerian-Aryan equation did not receive any support at the time, despite having sent personal copies of his two books to Archibald Sayce. Professor Langdon, who had earlier offered Waddell his support for a Sumerian or Proto-Elamite decipherment of the Indus-Valley seals, dismissed Waddell's publications on the Sumerian language itself: