In a second edition of his book, published in 1905, Nilus gives a brief autobiographical account of himself. He says that he was born in 1862 of Russian parents who held liberal opinions, and that his family was well known in Moscow, its members being educated people who were firm in their allegiance to the Tsar and the Greek Church. This is hardly what a Russian of the period would describe as holding "liberal opinions," but let that pass. Nilus claims to have been graduated from Moscow University and to have held a number of civil-service posts, all of them, so far as his specifications go, connected with the police and judicial systems. He went to the government of Orel, where he became a landowner and a sort of petty noble. He entered the Troitsky-Sergevsky Monastery, near Moscow, or so he says. Although numerous efforts have been made in Russia to find this Sergei Nilus, none has succeeded. It is true that a number of persons have testified to the existence of Sergei Nilus, but in each case a different person has been referred to, though Nilus is not a Russian name or commonly found in Russia. The present writer learned of two men, father and son, each bearing this very unusual name. First information led to the belief that at last the mysterious author had been discovered. The father was of about the right age and was said to be a writer interested in religious subjects. Further inquiry elicited the information that this man had died in 1910, whereas the Nilus we are interested in was alive as late as 1917. Greatly enlarged editions of his work, with new personal matter added, appeared in 1911 and 1917. Obviously, therefore, the man who died in 1910 was not our author. The anonymous editor of an edition of the protocols issued in New York toward the end of 1920 says that "a returning traveler from Siberia in August, 1919, was positive that Nilus was in Irkutsk in June of that year." No clew is given to the identity of the editor who makes this statement. And here let me remark in passing that it is a remarkable fact that _all_ the editors of the numerous editions of the protocols, both here and abroad, are very shy persons and hide under the mask of anonymity. Nor is any clew given to the identity of the traveler from Siberia. Another report, also by a traveler returned from Siberia, who may possibly be the same person, makes it appear that the Nilus who was at Irkutsk is the son of the man who died in 1910, and is himself too young to fit the autobiographical sketch of the man born in 1862. I can only add to the foregoing, which represents all that I have been able to find out about Nilus, that there was an edition of the protocols published in Kishinev in 1906, the name of the author of the book in which they appeared being given as Butmi de Katzman.