Explanation:

- Duguit: Léon Duguit was a French scholar and jurist, known for his theories on public law and the separation of private and public law. He did not focus on Montesquieu's use of historical method.

- Savigny: Friedrich Carl von Savigny was a German jurist and leading figure in the historical school of law. He focused on law as an evolving cultural phenomenon, but he did not describe Montesquieu in this regard.

- Puchta: Georg Friedrich Puchta was a German jurist who contributed to the historical and systematic study of law but did not specifically highlight Montesquieu’s historical method.

- Maine: Sir Henry Maine was a British comparative jurist and historian. He praised Montesquieu for using the historical method in legal studies.

- Maine is known for highlighting Montesquieu’s approach as the first historical method in juristic studies.