Now, although the roots of the mystery story in serious literature go back as far as Balzac, Dickens, and Poe, it was not until the closing decades of the 19th century that the private detective became an established figure in popular fiction.

This Europeanization of the law was made explicit by a number of 19th century scholars.

The Civil War was a significant force in the eventual dominance of the singular usage by the end of the 19th century.

In the zoological sciences, some of his observations were confirmed to be accurate only in the 19th century.

His works contain the earliest known formal study of logic, which was incorporated in the late 19th century into modern formal logic.

With the Prior Analytics, Aristotle is credited with the earliest study of formal logic, and his conception of it was the dominant form of Western logic until 19th century advances in mathematical logic.

The term was originally coined in the 19th century by the founding sociologist and philosopher of science, Auguste Comte, and has become a major topic for psychologists ( especially evolutionary psychology researchers ), evolutionary biologists, and ethologists.

From its beginnings in the early 19th century through the early 20th century, anthropology in the United States was influenced by the presence of Native American societies.

In Greece, there was since the 19th century a science of the folklore called laographia ( laography ), in the form of " a science of the interior ", although theoretically weak ; but the connotation of the field deeply changed after World War II, when a wave of Anglo-American anthropologists introduced a science " of the outside ".

The Apollo Belvedere is a marble sculpture that was rediscovered in the late 15th century ; for centuries it epitomized the ideals of Classical Antiquity for Europeans, from the Renaissance through the 19th century.

Early 19th century.

In the Middle Bronze Age an apparently " alphabetic " system known as the Proto-Sinaitic script is thought by some to have been developed in the Sinai peninsula during the 19th century BC, by Canaanite workers in the Egyptian turquoise mines.

From the 19th century it once again became more and more popular.

Yombe people | Yombe-sculpture, 19th century

Portugal has been present in Angola for 400 years, occupied the territory in the 19th and early 20th century, and ruled over it for about 50 years.

Distinctions in vocabulary persist, for example, in culinary terms, where communication with Germans is frequently difficult, and administrative and legal language, which is due to Austria's exclusion from the development of a German nation-state in the late 19th century and its manifold particular traditions.

Until the late 19th century, the axiom of choice was often used implicitly, although it had not yet been formally stated.

The Iron is a famous 19th century landmark in central Norrköping

The museum can be found in the 19th century building The Iron in the Motala ström river in central Norrköping.

With the beginning of the slow decline of the Ottoman Empire in the early 19th century, and as a result of the expansionist policies of Czarist Russia in the Caucasus, many Muslim nations and groups in that region, mainly Circassians, Tatars, Azeris, Lezgis, Chechens, and several Turkic groups left their ancestral homelands and settled in Anatolia.

Later in the 19th century, other missionaries adapted Evans ' system to other Canadian aboriginal languages.

Charles Dickens was a prominent English author of the 19th century.

Leo Tolstoy was a prominent Russian author of the 19th century.

The idea that alternative mathematical systems might exist was very troubling to mathematicians of the 19th century and the developers of systems such as Boolean algebra made elaborate efforts to derive them from traditional arithmetic.

As VanSlyck ( 1991 ) showed, the last years of the 19th century saw acceptance of the idea that free libraries should be available to the American public.

When the idea of a modern Olympics became a reality at the end of the 19th century, the initiators and organizers were looking for a great popularizing event, recalling the ancient glory of Greece.

The 19th century economist and philosopher Frédéric Bastiat expressed the idea that trade deficits actually were a manifestation of profit, rather than a loss.

Jewish and Christian tradition viewed Moses as the author of Exodus and the entire Pentateuch, but by the end of the 19th century the increasing awareness of the discrepancies, inconsistencies, repetitions and other features of the Pentateuch had led scholars to abandon this idea.

The mathematical roots of the idea of fractals have been traced through a formal path of published works, starting in the 17th century with notions of recursion, then moving through increasingly rigorous mathematical treatment of the concept to the study of continuous but not differentiable functions in the 19th century, and on to the coining of the word fractal in the 20th century with a subsequent burgeoning of interest in fractals and computer-based modelling in the 21st century.

The idea of an international organization for food and agriculture emerged in the late 19th and early 20th century.

It is considered archaic now, as the terms " acidic " and " basic rock " were based on an incorrect idea, dating from the 19th century, that silicic acid was the chief form of silicon occurring in rocks.

Grammarians of the Greek and Latin languages also showed an interest in aspect, but the idea did not enter into the modern Western grammatical tradition until the 19th century via the study of Slavic grammar.

Yet his idea, which emerged in the context of the ethnocentric and nationalistic scholarship of the late 18th and 19th centuries, gained traction and was modified over time to support Romantic nationalism and Turanism.

While there was no separate Polish state at all, the idea of Polish independence was kept alive throughout the 19th century and led to more Polish uprisings and other warfare against the partitioning powers.

For George Woodcock this attitude can be also motivated by certain idea of resistance to progress and of rejection of the growing materialism which is the nature of American society in the mid 19th century.

Studies of Charles Darwin's notebooks have shown that Darwin arrived separately at the idea of natural selection which he set out in his 1859 book On the Origin of Species, but it has been speculated that he may have had some half-forgotten memory from his time as a student in Edinburgh of ideas of selection in nature as set out by Hutton, and by William Charles Wells and Patrick Matthew who had both been associated with the city before publishing their ideas on the topic early in the 19th century.

In modern China, the idea of using lotteries to fund a public institution was not accepted before the late 19th century.

Thus three major themes in 19th century mathematics were combined by Lie in creating his new theory: the idea of symmetry, as exemplified by Galois through the algebraic notion of a group ; geometric theory and the explicit solutions of differential equations of mechanics, worked out by Poisson and Jacobi ; and the new understanding of geometry that emerged in the works of Plücker, Möbius, Grassmann and others, and culminated in Riemann's revolutionary vision of the subject.

* 1938 – Hermann Göring proposes plans to make Madagascar the " Jewish homeland ", an idea that had first been considered by 19th century journalist Theodor Herzl.

The canal idea was discussed seriously by businessmen and governments throughout the 19th century.

The idea of Robin Hood as a high-minded Saxon fighting Norman lords also originates in the 19th century.

In most countries, the idea of retirement is of recent origin, being introduced during the late 19th and early 20th centuries.

* Steampunk is based on the idea of futuristic technology existing in the past, usually the 19th century, and often set in Victorian era England — but with prominent elements of either science fiction or fantasy, such as fictional technological inventions like those found in the works of H. G. Wells and Jules Verne, or real technological developments like the computer occurring at an earlier date.

The idea was first clearly expressed by 19th century thinkers, such as Wilhelm von Humboldt, who saw language as the expression of the spirit of a nation.

In the late 18th and early 19th century the idea of the existence of different national characters, or " Volksgeister ", of different ethnic groups was the moving force behind the German school of national romanticism and the beginning ideologies of ethnic nationalism.

He then attempted to sell extracted lime juice as a medicine, but the lime juice had no effect in treating scurvy, due to the oxidization of vitamin C. Therefore, this solution was not adopted by the Royal Navy until the 1790s, and the idea that any acid would suffice continued in Britain into the late 19th century.

The idea of the division of memory into short-term and long-term dates back to the 19th century.

During the 19th century the idea that men were everywhere and always the same that had characterized both classical antiquity and the Enlightenment was exchanged for a more organic and dynamic evolutionary concept of human history.