Autograph letter signed from Jan Ingenhousz to 'den Heer [Jan] van Breda tot Delft', signed and dated 'J.Housz Wenen den 8 Maart 1786'. Ingenhousz lived in Vienna for many years [1768 - 1789], in the service of Empress Maria Theresa as Court Physician. The letter starting 'Mijn Heer & waarde Vriend', discusses a letter he encloses to the 'secretaris te Uytrecht' to which he has added some changes and additions. He can't help it that the secretary or other 'heren directeuren' [Provinciaal Genootschap Utrecht?] feel ill-will towards Barneveld [who wrote a book on medical electricity in 1785] and feels his demands are fair. The Count Wassenaar has already found 2 of his friends prepared to discuss the letter in the april 3 meeting. Ingenhousz says his experiments in electricity cause a stir in France. The Academy in Dijon, Bertholon and Achard he feels will not be pleased. A friend read his correspondence with Senebier of whom Ingenhousz states that he is quite wrong.
Wenen, Autograaf, 1786. 4to. 1 leaf folded twice. [18.5 x 23 cm]. Jan Ingen-Housz, Medical doctor and famous phycisist and plant physiologist, phycisist [1730 - 1799]. DSB, vol. VII pp. 11 - 16: Studied medicine and science at Leuven university and graduated there in 1753. Studied at Leiden where he attended lectures by Gaubius [pupil of Boerhaave], B.S.Albinus and Peter van Musschenbroek. Studied abroad in France and England. In Edinburgh and London he met William and John Hunter, Monroe, Benjamin Priestley [then very much interested in electricity] and his life long friend Benjamin Franklin. Ingenhousz became involved in inoculation and in 1768 travelled to Austria where he inoculated the Royal Family. Empress Maria Theresa appointed him court physician at 5000 guilders per annum for the rest of his life. He became a member of the Royal Society in 1778 and started his famous experiments on photosynthesis in 1779, in all probability based on Priestley's publication on the subject. '... the discovery of both photosynthesis and plant respiration belongs to Ingenhousz alone...'. Priestley and Senebier are often credited with the discovery, but '... neither of the two had even a vague understanding of this process before the publication of Ingenhousz..'He remained in Vienna until 1789, 3 years after the letter offered here. DMB, c. 952 - 956: The other important names from Ingenhousz' scientific circle and mentioned in this letter include Willem Barneveld [1757 - 1826], who was a founder of electrotherapy and wrote the three vol. work 'Geneeskundige Electriciteit' [1785 - 1789], follower of Nollet, Priestley and Franklin. Senebier [Jean, 1742 - 1809], plant physiology and photosynthesis research. Bertholon de Saint Lazare, Pierre [1741 - 1800], experiments w. electricity, publ. 1780, 1783, 1787. The 'Professor Moscati' mentioned in line 11, not traced.
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