This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.

Abstract in English, French and Russian.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.

Our readers see the books the same way that their first readers did decades or a hundred or more years ago. Books from that period are often spoiled by imperfections that did not exist in the original.