 documents thus coming from Mr. Sinnett were undoubtedly written by Madame Blavatsky.How far the K.H.letters received by Mr. Sinnett emanated from the brain of Madame Blavatsky, how far she was assisted in their production by confederates, how much of their substance was plagiarized from other writers, are questions which closely concern the intellectual ability of Madame Blavatsky, and which lie somewhat outside the present brief sketch."