|Doctoral advisor||Jan Jesenius|
|Doctoral students||Werner Rolfinck|
Daniel Sennert (November 25, 1572 – July 21, 1637) was a renowned German physician and a prolific academic writer, especially in the field of alchemy or chemistry. He held the position of professor of medicine at the University of Wittenberg for many years.
Sennert attended the University of Wittenberg and received his master's degree in 1598 and his medical degree in 1601. In his early work, he demonstrated an avoidance of alchemical theory and an acceptance of Aristotelian theory. However, within a decade of receiving his medical degree he had changed to accepting alchemical transmutation and experimentation as valid. He published a number of popular books on alchemy and chemistry, several of which received a number of reprintings and translations. He served on the faculty at the University of Wittenberg for the rest of his life, serving six times as the Dean of the medical faculty at Wittenberg, and also served as the physician to many aristocrats and rulers, including John George I, Elector of Saxony. He died of the plague in 1637 in Wittenberg.
Sennert is notable for his contributions to the development of an early version of atomic theory. Specifically, he forms an intermediate bridge between the works of Geber and the more recognized Corpuscularianists such as Robert Boyle. Corpuscularianism differs from modern atomic theory in a number of significant ways, most noticeably a lack of a mathematical argument for its existence, something Sennert specifically rejected. Sennert is an intermediate step between corpucular particle theory and Aristotelian forms. The same works that are often sited as demonstrating his early atomist views also emphasize the importance of substantial forms. Sennert's theories were based on an experiential and experimental evidence that he gathered both from eyewitness accounts and his own laboratory experience.
One of Sennert's most notable experiments was a variation on the "reduction to the pristine state." Taking an alloy of gold and silver, the silver was dissolved from the alloy in aqua fortis. In the classic "reduction to the pristine state," the silver was then precipitated out of the aqua fortis by the addition of salt of tartar and then heated in a crucible to return it to its recognizable metallic form. Sennert's innovation on this experiment was the addition of pouring the silver-aqua fortis solution through a paper filter before precipitating the silver from the solution. This experiment was used as evidence that the silver remained in the mixture in the form of minuscule particles, rather than dissolving into its Aristotelian components. It appears to have inspired similar experiments on the part of Robert Boyle and others used to establish acceptance of Corpuscularianism.
- Institutiones medicinae (Wittenberg, 1611)
- Epitome scientiae naturalis (1618)
- De chymicorum cum Aristotelicis et Galenicis consensu ac dissensu (Wittenberg, 1619)
- Practicae medicinae (Wittenberg, 1635) in 6 vols.
- Hypomnemata physicae (Frankfurt, 1636)
- Newman, William Royall (2006). Atoms and alchemy: chymistry and the experimental origins of the scientific revolution. University of Chicago Press. ISBN 978-0-226-57697-8. Retrieved 7 March 2011.
- Galileo Project page
- Meinel, Christoph, "Early Seventeenth-Century Atomism: Theory, Epistemology, and the Insufficiency of Experiment" Isis, Vol. 79, No. 1 (March 1988), The University of Chicago Press on behalf of The History of Science Society, pp. 68-103.
- Michael, Emily, "Daniel Sennert on Matter and Form: At the Juncture of the Old and the New," Early Science and Medicine Vol. 2, No. 3, The Fate of Hylomorphism. "Matter" and "Form" in Early Modern Science (1997), BRILL, pp. 272-299.
- Hiro Hirai, "Daniel Sennert on Living Atoms, Hylomorphism and Spontaneous Generation," in: Hiro Hirai, Medical Humanism and Natural Philosophy: Renaissance Debates on Matter, Life and the Soul (Boston-Leiden: Brill, 2011), 151-172.