18 February 1626|
|Died||1 March 1697
|Fields||Medicine, entomology, parasitology, linguistics|
|Alma mater||University of Pisa|
|Known for||Experiments challenging spontaneous generation|
Francesco Redi (18 February 1626 – 1 March 1697) was an Italian physician, naturalist, and poet. He was the first scientist to challenge the theory of spontaneous generation by demonstrating that maggots come from eggs of flies. He was also the first to recognize and correctly describe details of many important parasites, and for this reason, as many historians and scientists claim, he may rightly be called the father of modern parasitology, and also regarded as the founder of experimental biology.
The son of Gregorio Redi and Cecilia de Ghinci was born in Arezzo on February 18, 1626. His father was a renowned physician at Florence. After schooling with the Jesuits, he attended the University of Pisa from where he obtained his doctoral degrees in medical and philosophy in 1647, at the age of 21. He constantly moved to Rome, Naples, Bologna, Padua, and Venice, and finally settled in Florence in 1648. Here he was registered at the Collegio Medico where he served at the Medici Court as both the head physician and superintendent of the ducal apothecary to Ferdinando II de' Medici, Grand Duke of Tuscany and his successor, Cosimo III. It is here that most of his academic works were achieved, which earned him membership in Accademia dei Lincei. He was also a member of the Accademia del Cimento (Academy of Experiment) from 1657 to 1667.
A collection of his letters is held at the National Library of Medicine in Bethesda, Maryland.
In 1664 Redi wrote his first monumental work Osservazioni intorno alle vipere (Observations about the Viper) to his friend Lorenzo Magalotti, secretary of the Accademia del Cimento. In this he began to break the prevailing scientific myths (which he called "unmasking of the untruths") such as vipers drink wine and shatter glasses, the venom is poisonous if swallowed, head of dead viper is an antidote, the viper venom is produced from the gallbladder, and so on. He explained rather how snake venom is unrelated to the snake’s bite, an idea contrary to popular belief. He performed a series of experiments on the effects of snakebites, and demonstrated that venom was poisonous only when it enters the bloodstream via a bite, and that the fang contains venom in the form of yellow fluid. He even showed that by tight ligature before the wound the passage of venom into the heart could be prevented. This work marked the beginning of experimental toxinology/toxicology.
Entomology and spontaneous generation
Redi is most well known for his series of experiments, published in 1668 as Esperienze Intorno alla Generazione degl'Insetti (Experiments on the Generation of Insects), which is regarded as his masterpiece and a milestone in the history of modern science. The book is one of the first steps in refuting "spontaneous generation" - a theory also known as Aristotelian abiogenesis. At the time, prevailing wisdom was that maggots arose spontaneously from rotting meat.
Redi took six jars and divided in two groups of three: In one experiment, in the first jar of each group, he put an unknown object; in the second, a dead fish; in the last, a raw chunk of veal. Redi covered the tops of the first group jars with fine gauze so that only air could get into it. He left the other group open. After several days, he saw maggots appear on the objects in the open jars, on which flies had been able to land, but not in the gauze-covered jars. In the second experiment, meat was kept in three jars. One of the jars was uncovered, and two of the jars were covered, one with cork and the other one with gauze. Flies could only enter the uncovered jar, and in this, maggots appeared. In the jar that was covered with gauze, maggots appeared on the gauze but did not survive.
He continued his experiments by capturing the maggots and waiting for them to metamorphose, which they did, becoming flies. Also, when dead flies or maggots were put in sealed jars with dead animals or veal, no maggots appeared, but when the same thing was done with living flies, maggots did. Knowing full well the terrible fates of out-spoken scientists like Giordano Bruno and Galileo Galilei, Redi was careful to express his new views in a manner that would not contradict to theological tradition of the Church; hence, his interpretations were always based on biblical passages, such as his famous adage: omne vivum ex vivo ("All life comes from life").
Redi was the first to describe ectoparasites in his Esperienze intorno alla generazione degli insetti. His notable illustrations in the book are those relevant to ticks, including deer and tiger ticks; it also contains first depiction of the larva of Cephenemyiinae, the nasal flies of deer, as well as the sheep liver fluke (Fasciola hepatica). His next treatise in 1684 titled Osservazioni intorno agli animali viventi che si trovano negli animali viventi (Observations on Living Animals, that are in Living Animals) recorded the descriptions and the illustrations of more than 100 parasites. In it he also differentiates the earthworm (generally regarded as a helminth) and Ascaris lumbricoides, the human roundworm. An important innovation from the book is his experiments in chemotherapy in which he employed the "control"', the basis of experimental design in modern biological research. Altogether he is known to describe some 180 species of parasites. Perhaps, his most significant observation was that parasites produce eggs and develop from them, which contradicts the prevailing opinion that they are produced spontaneously.
As a poet, Redi's best known work is the dithyramb, Bacco in Toscana ("Bacchus in Tuscany"), which appeared posthumously, and is considered one of the best literary works of the 17th century. His bacchanalian poem in praise of Tuscan wines is still read in Italy today. He was admitted to two literary societies: the Academy of Arcadia and the Accademia della Crusca. He was an active member of Crusca and supported the preparation of the Tuscan dictionary. He taught the Tuscan language as a lettore publio di lingua toscana in Florence in 1666. He also composed many other literary works, including his Letters, and Arianna Inferma.
- A crater on Mars was named in his honour.
- The larval stage of parasitic fluke called "redia" is named after Redi by another Italian zoologist, Filippo de Filippi, in 1837.
- The Redi Award, the most prestigious award in toxinology, is given in his honour by the International Society on Toxinology. The award is made at each World Congress of IST (generally held every three years) since 1967.
- A scientific journal Redia, an Italian journal of zoology, is named in his honour, which was first published in 1903.
- A European viper subspecies, Vipera aspis francisciredi Laurenti, 1768, is named in his honour.
- "Francesco Redi". Encyclopædia Britannica. Encyclopædia Britannica, Inc. Retrieved 22 October 2013.
- Levine R, Evers C. "The Slow Death of Spontaneous Generation (1668-1859)". Retrieved 2013-04-18.
- Roncalli Amici R (2001). "The history of Italian parasitology". Veterinary Parasitology 98 (1–3): 3–10. doi:10.1016/S0304-4017(01)00420-4. PMID 11516576.
- Mehlhorn H (2008). Encyclopedia of Parasitology, Volumes 1-2. Veterinary Parasitology (3 ed.) (Springer-Verlag). p. 610. ISBN 3540489940.
- Leikola A (1977–78). "Francesco Redi as a pioneer of experimental biology". Lychnos Lardomshist Samf Arsb. 1977-78 (1–3): 115–122. PMID 11628017.
- Ioli, A; Petithory, JC; Théodoridès, J (1997). "Francesco Redi and the birth of experimental parasitology". Histoire des sciences medicales 31 (1): 61–6. PMID 11625103.
- Hawgood BJ (2003). "Francesco Redi (1626-1697): Tuscan philosopher, physician and poet". Journal of Medical Biography 11 (1): 28–34. PMID 12522497.
- Francesco Redi of Arezzo (1909) . Mab Bigelow (translation and notes), ed. Experiments on the Generation of Insects. Chicago: Open Court. Retrieved March 2, 2010.
- Francesco Redi of Arezzo (1825) . Leigh Hunt (translation and notes), ed. Bacchus in Tuscany. London: Printed by J. C. Kelly for John and H. L. Hunt. Retrieved March 2, 2010.
- "Francesco Redi Letters 1683-1693". National Library of Medicine.
- Francesco Redi (1988). Knoefel PK, ed. Francesco Redi on Vipers. Leiden, the Netherlands: E.J. Brill. pp. 11–17. ISBN 9004089489. Retrieved 2013-04-18.
- Habermehl GG (1994). "Francesco Redi¬—life and work". Toxicon 32 (4): 411–417. doi:10.1016/0041-0101(94)90292-5. PMID 8052995.
- Buettner KA (2007). Francesco Redi (The Embryo Project Encyclopedia ). ISSN 1940-5030. Retrieved 2013-04-18.
- Hayes AN, Gilbert SG (2009). "Historical milestones and discoveries that shaped the toxicology sciences". EXS 99 (1): 1–35. doi:10.1007/978-3-7643-8336-7_1. PMID 19157056.
- Redi F. "Esperienze intorno alla generazione degl'insetti fatte da Francesco Redi".
- Barnett B (30 September 2011). "Francesco Redi and Spontaneous Generation". Retrieved 2013-04-18.
- Gottdenker P (1979). "Francesco Redi and the fly experiments". Bull Hist Med 53 (4): 575–592. PMID 397843.
- Ioli A, Petithory JC, Théodoridès J (1997). "Francesco Redi and the birth of experimental parasitology". Hist Sci Med 31 (1): 61–66. PMID 11625103.
- Bush AO, Fernández JC, Esch GW, Seed JR (2001). Parasitism: The Diversity and Ecology of Animal Parasites. Cambridge, UK: Cambridge University Press. p. 4. ISBN 0521664470.
- SpaceRef (August 14, 2004). "NASA Mars Odyssey THEMIS Image: Promethei Terra". Retrieved 2013-04-18.
- International Society on Toxinology. "IST Redi Awards". Retrieved 2013-04-18.
- REDIA – Journal of Zoology. "History". Retrieved 2013-04-18.
- Altieri Biagi, Maria Luisa (1968). Lingua e cultura di Francesco Redi, medico. Florence: L. S. Olschki. ASIN B00A30Z37W.
- Francesco Redi entry in the Catholic Encyclopedia
- Experiments on the Generation of Insects, translation of the 5th edition (1688)
- Bacco in Toscana (English translation: Bacchus in Tuscany)
- Francesco Redi at Princeton.edu
- Biography at Katringale
- Biographical Website of Francesco Redi
- Rediʼs Experiment
- Famous Scientists: Francisco Redi
- Francisco Redi at the Galileo Project
- Francisco Redi at Ketterer Kunst
- Francisco Redi at The Free Dictionary
- Francisco Redi at Infoplease
- Spontaneous generation and Francesco Redi
- Galileo's Twin