"The Bab wrote to Haji Muhammad-Karim Khan ... and invited him to acknowledge his authority. This the latter not only entirely refused to do, but further wrote a treatise against the Bab and his doctrines." (P. 910.) "At least two such treatises were written by Haji Muhammad-Karim Khan. One of them was composed at a later date than this, probably after the Bab's death, at the special request of Nasiri'd-Din Shah. Of these two one has been printed, and is called `the crushing of falsehood' ( Izhaqu'l-Batil)." (Footnote 1, p. 910.) (Journal of the Royal Asiatic Society, 1889, article 12.)