Jacobus Henricus van’t Hoff (1852-1911) writes to Georg Bredig (1868-1944) about ammonia as a catalyst.

Envelope glued to the back of the letter.

Letter from Georg Bredig (1868-1944 ) to his colleague, Jacobus Henricus van't Hoff (1852-1911) , a Dutch physical chemist. Bredig seeks advice for finding an example of an optically active catalyst acting on optically…

Svante Arrhenius (1859-1927) writes to Georg Bredig (1868-1944), announcing his new position at the Nobel Institute for Physical Chemistry. He expresses his hopes that he will stay in his new position until he retires.…

Hendrik Willem Bakhuis Roozeboom (1854-1907), a Dutch chemist, updates Georg Bredig (1869-1944) on recent scientific studies of solid, liquid, and vapor phases.

Svante Arrhenius (1859-1927) writes to Georg Bredig (1868-1944) asking him to allow Maziter Wegelius to study under him. Arrhenius tells Bredig that the Nobel Institute for Physics and Chemistry will open in October…

Svante Arrhenius (1859-1927) writes to Georg Bredig (1868-1944) with updates on the scientific community.

Wilhelm Ostwald (1853-1932) is retiring and wants to become a private scholar. Ostwald had semi-retired in…

Black and white portrait of Ernst Stern, taken in Karlsruhe Germany. Stern was a German psychiatrist, psychologist, and educator who was known for his work in psychosomatics and as a clinical psychologist. Stern…

Ludwig Gattermann (1860-1920) writes to Georg Bredig (1868-1944) about substances that show the appearance of liquid crystals, along with chemical equations and a suggestion to look at a book by Otto Lehmann…

Ernst Winterstein (1865-1949) asks Georg Bredig (1868-1944) to send him a copy of his habilitation thesis on colloidal metals.

Wilhelm Ostwald (1853-1932), a pioneer in physical chemistry and the winner of the 1909 Nobel Prize for Chemistry, apologizes that he categorized Georg Bredig's (1868-1944) recent essay on catalysis as a report instead…

Published by the German Bunsen Society for Applied Physical Chemistry.

Picture postcard sent to Rosa Bredig (1877-1933) from her husband, Georg Bredig (1868-1944). The black and white photograph features a portrait of Wilhelm Ostwald (1853-1932) wearing a hat.

Ostwald was a German…

Jacobus van't Hoff (1852-1911), a Dutch physical chemist, writes to his colleague, Georg Bredig (1868-1944), to inform him of a repair status for laboratory equipment. Van't Hoff additionally conveys greetings from a…

Jacobus Henricus van’t Hoff (1852-1911) tells Georg Bredig (1868-1944) that he sent his essay (Bredig's) to August Friedrich Horstmann (1842-1929).

Van't Hoff is considered to be one of the founding fathers of…

A postcard from Svante Arrhenius (1859-1927) to Georg Bredig (1868-1944) containing a short professional update and congratulations for the birth of Bredig's daughter Marianne Homburger, nee Bredig (1903-1986) .

Group photograph of Theodor Curtius's ( 1857-1928) 25th Anniversary celebration of his doctorate.

Those pictured are identified by annotations handwritten beneath the photograph.
Front row, left to right, Eduard…

Postcard from Svante Arrhenius (1859-1927) to Georg Bredig (1864-1944) containing Arrhenius' train information for a trip to Heidelberg.

Jacobus Henricus van’t Hoff (1852-1911) invites Georg Bredig (1868-1944) and Rosa Bredig (1877-1933) to dinner.

Jacobus Henricus van’t Hoff (1852-1911) sends Georg Bredig (1868-1944) a copy of works by August Friedrich Horstmann (1842-1929) with van't Hoff's corrections.

R.F. Fuchs’ handwritten 1902 article in the Biologisches Centralblatt examines the similarities between colloid solutions and enzymes, with a focus on experiments conducted by Georg Bredig (1868-1944) and colleagues.
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Portrait of Paul Erhardt Jannasch (1841-1921) by F. Langbein & Company. Jannasch was a German chemist and professor at the University of Heidelberg.