restrained by the other branches. (Habeas corpus is an example of a check that the judicial branch has on the executive branch of government.) In a lengthy discussion of the English political system, he tries to show how this might be achieved and liberty secured, even in a monarchy. He also notes that liberty cannot be secure where there is no separation of powers, even in a republic. The appropriate framing of civil and criminal laws so as to ensure personal security. Montesquieu intends what modern legal scholars might call the rights to "robust procedural due process", including the right to a fair trial, the presumption of innocence and the proportionality in the severity of punishment. Pursuant to this requirement to frame civil and criminal laws appropriately to ensure political liberty (i.e., personal security), Montesquieu also argues against slavery and for the freedom of thought, speech and assembly. This book mainly concerns explicit laws, but also pays considerable attention to cultural norms that may support the same goals. "Montesquieu believed the hard architecture of political institutions might be enough to constrain overreaching power — that constitutional design was not unlike an engineering problem," as Levitsky and Ziblatt put it. Political sociology The third major contribution of The Spirit of Law was to the field of political sociology, which Montesquieu is often credited with more or less inventing. The bulk of the treatise, in fact, concerns how geography and climate interact with particular cultures to produce the spirit of a people. This spirit, in turn, inclines that people toward certain sorts of political and social institutions, and away from others. Later writers often caricatured Montesquieu's theory by suggesting that he claimed to explain legal variation simply by the distance of a community from the equator. While the analysis in The Spirit of Law is much more subtle than these later writers perceive, many of his specific claims lack rigour to modern readers. Nevertheless, his approach to politics from a naturalistic or scientific point of view proved very influential, directly or indirectly inspiring modern fields of political science, sociology, and anthropology. See also Comparative law Democracy Doux commerce Letter and spirit of the law Rule of law Mutual Liberty Notes References Montesquieu, L'esprit des loix. Texte établi et présenté par Jean Brethe de La Gressaye (Paris: Societe Les Belles Lettres, 1950–1961. Takes account of variants in all editions issued between 1748 and