Explanation:

Correct option 4: Savigny

Friedrich Carl von Savigny, a German legal scholar, wrote about the "Organic Concept of Society" as part of his contribution to the Historical School of Jurisprudence. He believed that law is not made but grows organically with the society, much like a language or custom. His ideas oppose the notion that laws can be arbitrarily created; instead, they should reflect the historical and cultural spirit (Volksgeist) of the people.

The other options are not correct in this context:

1. Durkheim – A sociologist who focused on social facts and institutions, not specifically on the organic theory of law.

2. Durguit – Likely a misspelling; no prominent author by this name in legal theory.

3. August Comte – Known as the father of sociology and positivism, but not for this concept in legal theory.

Hence, the book "Organic Concept of Society" is attributed to Savigny.