What is the main conflict in Consilience: The Unity of Knowledge by Edward O. Wilson?

Wilson develops the idea of unified learning when gaining insight into nature during his science studies. His view of the classification of species as connected with evolution is influenced by Linnaeus, who classifies animals and species into groups, families, orders and kingdoms. This ordering reminds one of the way armies are organized with platoons, armed services heading armies, and with chiefs of staff at the top.