While in exile Lenin sent most of his letters to P. B. Axelrod concealed in the inside of book-covers. Passing through several hands, these letters eventually found their way abroad to A. I. Ulyanova-Yelizarova, Lenin's sister, who lived in Berlin at the time, and she forwarded them on to Axelrod. This particular letter was copied out by her and inserted in the middle of the text of her own letter to Axelrod.
Meaning Anna Ilyinichna Ulyanova-Yelizarova, Lenin's sister.
This refers to the journal Novoye Slovo in which two articles of Lenin's were published in 1897: "A Characterisation of Economic Romanticism" and "About a Certain Newspaper Article" (see Vol. 2 of this edition).
Novoye Slovo (New Word ) -- a scientific, literary and political monthly published in St. Petersburg from 1894 by the liberal Narodniks, and from the spring of 1897 by the "legal Marxists". The journal was closed down by the government in December 1897.