Marci was born in Lanškroun, near the border between historical landsBohemia and Moravia. He studied under Athanasius Kircher, and spent most of his career as a professor of Charles University in Prague, where he served eight times as Dean of the medical school and once as Rector in 1662. He was also the personal doctor of Emperors Ferdinand III and Leopold I, and distinguished himself in the defense of Prague against the Swedish armies in 1648. In October 1654 he was given the nobility title "de Kronland". It is contested whether Marci was a member of the Royal Society. Some claim that he was elected as a corresponding member in 1667. Other dispute this and argue that a Fellowship was not granted due to his death in this year. Unlike in the legend spread by Jesuit order, he did not join the Jesuit order shortly before his death.
Work
Marci's studies covered the mechanics of colliding bodies, epilepsy, and the refraction of light, as well as other topics. Prior to Marci, the prevailing theory of color assumed that light was modified by the action of a medium to produce color. Most theories were based upon the assumption that color was simply a modification of light varying between whiteness and blackness. Marci preceded Isaac Newton in his belief that "Light is not changed into colors except by a certain refraction in a dense medium; and the diverse species of colors are the products of refraction." Although he thought that different colors were caused by varying angles of incidence across the 1/2 degree apparent diameter of the sun, he stated that each color was condensed or disentangled from the others after refraction into homogeneous or elementary colors of red, green, blue and purple, and that no further change in color was obtained by additional refraction of elementary colors. Marci at some time came into possession of the Voynich Manuscript, apparently upon the death of its former owner, the alchemist Georg Baresch. He sent the book to his longtime friend Athanasius Kircher, with a cover letter dated 19 August 1666, or possibly 1665. This cover letter has remained intact and was present when the manuscript was obtained by Wilfrid Voynich. He is remembered today by the award of an annual medal to distinguished scientists by the Slovak-Czech Spectroscopy Society.
Books
Operatricum Idea
Idearum operaticum idea
De proportione motus seu regula sphygmica
Thaumantias. Liber de arcu coelesti deque colorum apparentium natura, ortu, et causis
Dissertatio de natura iridis
Labyrinthus, in quo via ad circuli quadraturam pluribus modis exhibetur
