At the starting point, that is. Such a reading, though forced, may interests you a bit in its relation to the evolution idea. As we know, in the period of modern civil society and civil state, the biological aspect goes behind the strong argument for freedom and equality. In 19th century, Darwin, or Spencer energetically explained their idea of evolution. We can see how various ideas are sinking and floating in the great stream of the age.
Maine is a famous figure who describes different types of law in terms of evolution.
I shall cite a controversy. H. Kato, originally supported the natural rights theory, switched his idea from it to Darwinism to criticize natural rights in terms of the law of jungle. T. Baba criticized Kato's idea by standing on the evolution theory, and yet to defend and maintain natural rights theory in terms of social differentiation. In addition, N. Hozumi wrote the theory of legal evolution. Returning to the present, we can listen old voices of advice from the past.