Karl Weigert, Carl Weigert (19 March 1845 in Münsterberg in

Silesia Silesia (see names #Etymology, below) is a historical region of Central Europe that lies mostly within Poland, with small parts in the Czech Silesia, Czech Republic and Germany. Its area is approximately , and the population is estimated at 8, ...

– 5 August 1904 in

Frankfurt am Main Frankfurt am Main () is the most populous city in the States of Germany, German state of Hesse. Its 773,068 inhabitants as of 2022 make it the List of cities in Germany by population, fifth-most populous city in Germany. Located in the forela ...

) was a German

Jewish Jews (, , ), or the Jewish people, are an ethnoreligious group and nation, originating from the Israelites of History of ancient Israel and Judah, ancient Israel and Judah. They also traditionally adhere to Judaism. Jewish ethnicity, rel ...

pathologist Pathology is the study of disease. The word ''pathology'' also refers to the study of disease in general, incorporating a wide range of biology research fields and medical practices. However, when used in the context of modern medical treatme ...

. His nephew was Fritz Weigert and his cousin was

Paul Ehrlich Paul Ehrlich (; 14 March 1854 – 20 August 1915) was a Nobel Prize-winning German physician and scientist who worked in the fields of hematology, immunology and antimicrobial chemotherapy. Among his foremost achievements were finding a cure fo ...

. He received his education at the universities of

Berlin Berlin ( ; ) is the Capital of Germany, capital and largest city of Germany, by both area and List of cities in Germany by population, population. With 3.7 million inhabitants, it has the List of cities in the European Union by population withi ...

Vienna Vienna ( ; ; ) is the capital city, capital, List of largest cities in Austria, most populous city, and one of Federal states of Austria, nine federal states of Austria. It is Austria's primate city, with just over two million inhabitants. ...

, and Breslau, graduating in 1868. After having taken part in the

Franco-Prussian war The Franco-Prussian War or Franco-German War, often referred to in France as the War of 1870, was a conflict between the Second French Empire and the North German Confederation led by the Kingdom of Prussia. Lasting from 19 July 1870 to 28 Janua ...

as assistant surgeon, he settled in Breslau, and for the following two years, was an assistant to Heinrich Waldeyer; from 1870 to 1874 to Hermann Lebert, and then to

Julius Cohnheim Julius Friedrich Cohnheim (20 July 1839 – 15 August 1884) was a German-Jewish pathologist. Biography Cohnheim was born at Demmin, Pomerania. He studied at the universities of Würzburg, Marburg, Greifswald, and Berlin, receiving his doctoral de ...

, who he followed to the

University of Leipzig Leipzig University (), in Leipzig in Saxony, Germany, is one of the world's oldest universities and the second-oldest university (by consecutive years of existence) in Germany. The university was founded on 2 December 1409 by Frederick I, Electo ...

in 1878. There he became an associate professor of pathology in 1879. In 1884, he was appointed professor of pathological anatomy at the Senckenbergsche Stiftung in

, and received the title of "Geheimer Medizinal-Rat" in 1899. He is buried in

Old Jewish Cemetery, Frankfurt The Old Jewish Cemetery of Frankfurt is located at Rat-Beil-Straße ("Councillor Beil Street") directly adjacent to the oldest parts of the gentile Frankfurt Main Cemetery. Together, Frankfurt Main Cemetery, the Old Jewish Cemetery and the N ...

(Juedischer Friedhof Rat-Beil-Straße). Weigert assisted Cohnheim in many of his researches, and wrote much on the

staining Staining is a technique used to enhance contrast in samples, generally at the Microscope, microscopic level. Stains and dyes are frequently used in histology (microscopic study of biological tissue (biology), tissues), in cytology (microscopic ...

bacteria Bacteria (; : bacterium) are ubiquitous, mostly free-living organisms often consisting of one Cell (biology), biological cell. They constitute a large domain (biology), domain of Prokaryote, prokaryotic microorganisms. Typically a few micr ...

microscopy Microscopy is the technical field of using microscopes to view subjects too small to be seen with the naked eye (objects that are not within the resolution range of the normal eye). There are three well-known branches of microscopy: optical mic ...

. In 1884, he introduced a precise method for staining

myelin sheaths Myelin Sheath ( ) is a lipid-rich material that in most vertebrates surrounds the axons of neurons to insulate them and increase the rate at which electrical impulses (called action potentials) pass along the axon. The myelinated axon can be lik ...

. He is credited with the discovery of vascular

tuberculosis Tuberculosis (TB), also known colloquially as the "white death", or historically as consumption, is a contagious disease usually caused by ''Mycobacterium tuberculosis'' (MTB) bacteria. Tuberculosis generally affects the lungs, but it can al ...

, and was the first to demonstrate how tuberculous material could enter the bloodstream.Professorenkatalog der Universität Leipzig
(biography) He contributed many essays to medical journals. Among his works are: * "Zur Anatomie der Pocken" (Breslau, 1874) * "Färbung der Bacterien mit Anilinfarben" (ib. 1875) * "Nephritis" (Leipzig, 1879) * "Fibrinfärbung" (1886) * "Beiträge zur Kenntniss der Normalen Menschlichen Neuroglia" (Frankfort am Main, 1895) * "Elastische Fasern" (ib. 1898)

Weigert-Meyer Rule

The Weigert-Meyer Rule describes the anatomic relationship of two ureters in a duplicated renal collecting system, as well as the resulting patterns of hydronephrosis, obstruction, and reflux. This pattern was first described by Weigert in 1877 and further defined as a "rule" by Dr. Robert Meyer in 1946.

Bibliography

* Pagel, J. L., ''Biog. Lex. s.v.'', Vienna, 1901; * ''Oesterreichische Wochenschrift'', 1904, pp. 533, 534

References

External links

*''Jewish Encyclopedia''
"Weigert, Karl"
by Isidore Singer & Frederick Haneman (1906). {{DEFAULTSORT:Weigert, Karl 1845 births 1904 deaths 19th-century German physicians German pathologists Silesian Jews People from Ziębice People from the Province of Silesia Burials at the Old Jewish Cemetery, Frankfurt