1891 in science

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The year 1891 in science and technology involved some significant events, listed below.

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Chemistry

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<span class="mw-page-title-main">Dementia praecox</span> Obsolete medical term for the schizophrenia and autism spectrums

Dementia praecox is a disused psychiatric diagnosis that originally designated a chronic, deteriorating psychotic disorder characterized by rapid cognitive disintegration, usually beginning in the late teens or early adulthood. Over the years, the term dementia praecox was gradually replaced by the term schizophrenia, which initially had a meaning that included what is today considered the autism spectrum.

<span class="mw-page-title-main">Snowball Earth</span> Worldwide glaciation episodes during the Proterozoic eon

The Snowball Earth is a geohistorical hypothesis that proposes during one or more of Earth's icehouse climates, the planet's surface became entirely or nearly entirely frozen with no liquid oceanic or surface water exposed to the atmosphere. The most academically referred period of such global glaciation is believed to have occurred sometime before 650 mya during the Cryogenian period.

<span class="mw-page-title-main">Julius Plücker</span> German mathematician and physicist

Julius Plücker was a German mathematician and physicist. He made fundamental contributions to the field of analytical geometry and was a pioneer in the investigations of cathode rays that led eventually to the discovery of the electron. He also vastly extended the study of Lamé curves.

The year 1850 in science and technology involved some significant events, listed below.

The year 1957 in science and technology involved some significant events, listed below.

The year 1934 in science and technology involved some significant events, listed below.

The year 1921 in science and technology involved some significant events, listed below.

The year 1870 in science and technology involved some significant events, listed below.

The year 1888 in science and technology involved some significant events, listed below.

The year 1839 in science and technology involved some significant events, listed below.

The year 1862 in science and technology involved some significant events, listed below.

The year 1875 in science and technology involved some significant events, listed below.

The year 1889 in science and technology involved some significant events, listed below.

The year 1893 in science and technology involved some significant events, listed below.

The year 1886 in science and technology involved some significant events, listed below.

<span class="mw-page-title-main">Evgraf Fedorov</span> Russian mathematician and crystallographer (1853–1919)

Evgraf Stepanovich Fedorov was a Russian mathematician, crystallographer and mineralogist.

<span class="mw-page-title-main">Agnes Pockels</span> German chemist (1862–1935)

Agnes Luise Wilhelmine Pockels was a German chemist whose research was fundamental in establishing the modern discipline known as surface science, which describes the properties of liquid and solid surfaces and interfaces.

<span class="mw-page-title-main">Heinrich Wilhelm Gottfried von Waldeyer-Hartz</span> German neuroscientist (1836–1921)

Heinrich Wilhelm Gottfried von Waldeyer-Hartz was a German anatomist, known for summarizing neuron theory and for naming the chromosome. He is also remembered by anatomical structures of the human body which were named after him: Waldeyer's tonsillar ring and Waldeyer's glands.

Events from the year 1854 in France.

The Smalfjord diamictite, Bigganjargga Tillite or Reusch's Moraine is a diamictite in Finnmark, northern Norway. The rock was first identified as a tillite by Hans Reusch in 1891, hence its name. The tillite overlies sandstone whose contact surface is striated. Reusch's Moraine belongs to the Smalfjord Formation, a geological formation of Neoproterozoic age. The tillite possibly formed during the Sturtian glaciation in connection to a global glaciation.

References

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  5. Hoffman, Paul F. (2011). "A history of Neoproterozoic glacial geology, 1871– 1997". In Arnaud, E.; Halverson, G.P.; Shields-Zhou, G. (eds.). The Geological Record of Neoproterozoic Glaciations. Geological Society, London, Memoirs. Geological Society of London. pp. 17–37.
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  11. "Ueber primäre chronische Demenz (so. Dementia praecox) im jugendlichen Alter". Prager medicinische Wochenschrift. 16: 312–15. 1891.
  12. von Waldeyer-Hartz, H. W. G. (1891). "Ueber einige neuere Forschungen im Gebiete der Anatomie des Centralnervensystems". Deutsche medicinische Wochenschrift. 17. Berlin: 1213–1356.
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  14. US 447918,Strowger, Almon B.,"Automatic telephone-exchange",published 1891-03-10
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