So it is simultaneously in his very first sentence a Marxist and a Darwinian vocabulary that Eikhenbaum is invoking, and that's what partly accounts for the strenuousness of his rhetoric.
Those titles that Eikhenbaum keeps talking about -how Don Quixote was Made, how Gogol's Overcoat was Made - reflect the preoccupation of the Russian formalists with how literature is put together.