Valdyr, Thanks much for reading Marx's doctoral dissertation so that I, among many others, do not have to wade through the difficult passage you quoted.
This passage is quite important, though, for it points to the gulf between human perception/consciousness and the natural, material relations from which they emerge. I have posted much on "the human perception/consciousness problem," and on the material organization of the brain that produces a "partial consciousness" that engages the things of life but misses the critical organization of those "things."
Enough on a personal crusade of mine. I think you would really enjoy John Bellamy Foster's Marx's Ecology (2000). Foster is the editor of Monthly Review, and this book explores the roots of Marx's ecology in Epicurus' materialism and the expression of this in his doctoral dissertation.
My red-green best.