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Lazzaro Spallanzani

Lazzaro Spallanzani
Born January 10, 1729 (1729-01-10)
Scandiano
Died February 12, 1799 (1799-02-13)
Pavia
Nationality Italian
Fields Biology
Known for Interpreting digestion, saying that it is a process of chemical solution

Lazzaro Spallanzani (10 January 1729 – 12 February 1799) was an Italian biologist and physiologist who made important contributions to the experimental study of bodily functions, animal reproduction, and essentially discovered echolocation. His research of biogenesis paved the way for the investigations of Louis Pasteur.

Contents

Career

He was born in Scandiano in the modern province of Reggio Emilia and died in Pavia, Italy. Spallanzani was educated at the Jesuit College and started to study law at the University of Bologna, which he gave up soon and turned to science. Here, his famous kinswoman, Laura Bassi, was professor of physics and it is to her influence that his scientific impulse has been usually attributed. With her he studied natural philosophy and mathematics, and gave also great attention to languages, both ancient and modern, but soon abandoned them.

In 1754, at the age of 25 he became professor of logic, metaphysics and Greek in the University of Reggio, and in 1760 was moved to Modena, where he continued to teach with great assiduity and success, but devoted his whole leisure to natural science. He declined many offers from other Italian universities and from St Petersburg until 1768, when he accepted the invitation of Maria Theresa to the chair of natural history in the university of Pavia, which was then being reorganized. He also became director of the museum, which he greatly enriched by the collections of his many journeys along the shores of the Mediterranean Sea. In 1775, Spallanzani was elected a foreign member of the Royal Swedish Academy of Sciences.

In 1785 he was invited to Padua University, but to retain his services his sovereign doubled his salary and allowed him leave of absence for a visit to Turkey where he remained nearly a year and made many observations, among which may be noted those of a copper mine in Chalki and of an iron mine at Principi. His return home was almost a triumphal progress: at Vienna he was cordially received by Joseph II and on reaching Pavia he was met with acclamations outside the city gates by the students of the university. During the following year his students exceeded five hundred. His integrity in the management of the museum was called in question, but a judicial investigation speedily cleared his honour to the satisfaction even of his accusers.

In 1788 he visited Vesuvius and the volcanoes of the Lipari Islands and Sicily, and embodied the results of his researches in a large work (Viaggi alle due Sicilie ed in alcune parti dell'Appennino), published four years later.

He died from bladder cancer on the 27th of February 1799, in Pavia. After his death, his bladder was removed for study by his colleagues, after which it was placed on public display in a museum in Pavia, Italy, where it remains to this day.

His indefatigable exertions as a traveller, his skill and good fortune as a collector, his brilliance as a teacher and expositor, and his keenness as a controversialist no doubt aid largely in accounting for Spallanzani's exceptional fame among his contemporaries; his letters account for his close relationships with many famed scholars and philosophers, like Buffon, Lavoisier, and Voltaire. Yet greater qualities were by no means lacking. His life was one of incessant eager questioning of nature on all sides, and his many and varied works all bear the stamp of a fresh and original genius, capable of stating and solving problems in all departments of science -- at one time finding the true explanation of stone skipping (formerly attributed to the elasticity of water) and at another helping to lay the foundations of our modern vulcanology and meteorology.

Discoveries

Spallanzani was a Catholic who researched the theory about the spontaneous generation of cellular life in 1768. His experiment proved that microbes move through the air and that they could be killed through boiling. This work paved the way for later research by Louis Pasteur.

The statue to Spallanzani in Scandiano has him examining a frog through a magnifying glass.

He also discovered and described animal (mammal) reproduction, showing that it requires both semen and an ovum. He was the first to perform in vitro fertilization, with frogs, and an artificial insemination, using a dog. Spallanzani showed that some animals, especially newts, can regenerate some parts of their body if injured or surgically removed.

Spallanzani is also famous for extensive experiments on the navigation in complete darkness by bats, where he concluded that bats use sound and their ears for navigation in total darkness(see [animal echolocation]). He was the pioneer of the original study of echolocation, though his study was limited to what he could observe. Later scientists moved onto studies of the sensory mechanisms and processing of this information.

His great work, however, is the Dissertationi di fisica animale e vegetale (2 vols, 1780). Here he first interpreted the process of digestion, which he proved to be no mere mechanical process of trituration - that is, of grinding up the food - but one of actual chemical solution, taking place primarily in the stomach, by the action of the gastric juice. He also carried out important researches on fertilization in animals (1780).

See also

References

General

  • Paul de Kruif, Microbe Hunters (2002 reprint) ISBN: 13-9780156027779
  • Nordenskiöld, E. P. 1935 [Spallanzani, L.] Hist. of Biol. 247-248
  • Rostand, J. 1997, Lazzaro Spallanzani e le origini della biologia sperimentale, Torino, Einaudi.

Work on insects

  • Conci, C. & Poggi, R. 1996 Iconography of Italian Entomologists, with essential biographical data. Mem. Soc. Ent. Ital. 75 159-382.
  • Gibelli, V. 1971 L. Spallanzani. Pavia.
  • Lhoste, J. 1987 Les entomologistes français. 1750-1950. INRA (Institut National de la Recherche Agronomique) , Paris.
  • Osborn, H. 1946 Fragments of Entomological History Including Some Personal Recollections of Men and Events. Columbus, Ohio, Published by the Author.
  • Osborn, H. 1952 A Brief History of Entomology Including Time of Demosthenes and Aristotle to Modern Times with over Five Hundred Portraits.Columbus, Ohio, The Spahr & Glenn Company.

External links


Lazzaro Spallanzani
Born Not recognized as a date. Years must have 4 digits (use leading zeros for years < 1000).
Scandiano
Died Not recognized as a date. Years must have 4 digits (use leading zeros for years < 1000).
Pavia
Nationality Italian
Fields Biology
Known for Interpreting digestion, saying that it is a process of chemical solution, and helping disprove the concept of spontaneous generation.

Lazzaro Spallanzani (10 January 1729 – 12 February 1799) was an Italian Catholic priest, biologist and physiologist who made important contributions to the experimental study of bodily functions, animal reproduction, and essentially discovered echolocation. His research of biogenesis paved the way for the investigations of Louis Pasteur.

Contents

Career

He was born in Scandiano in the modern province of Reggio Emilia and died in Pavia, Italy. Spallanzani was educated at the Jesuit College and started to study law at the University of Bologna, which he gave up soon and turned to science. Here, his famous kinswoman, Laura Bassi, was professor of physics and it is to her influence that his scientific impulse has been usually attributed. With her he studied natural philosophy and mathematics, and gave also great attention to languages, both ancient and modern, but soon abandoned them.

In 1754, at the age of 25 he became professor of logic, metaphysics and Greek in the University of Reggio. In 1762 he was ordained as a priest, 1763 he was moved to Modena,[1] where he continued to teach with great assiduity and success, but devoted his whole leisure to natural science. He declined many offers from other Italian universities and from St Petersburg until 1768, when he accepted the invitation of Maria Theresa to the chair of natural history in the university of Pavia, which was then being reorganized. He also became director of the museum, which he greatly enriched by the collections of his many journeys along the shores of the Mediterranean Sea. In 1775, Spallanzani was elected a foreign member of the Royal Swedish Academy of Sciences.

In 1785 he was invited to Padua University, but to retain his services his sovereign doubled his salary and allowed him leave of absence for a visit to Turkey where he remained nearly a year and made many observations, among which may be noted those of a copper mine in Chalki and of an iron mine at Principi. His return home was almost a triumphal progress: at Vienna he was cordially received by Joseph II and on reaching Pavia he was met with acclamations outside the city gates by the students of the university. During the following year his students exceeded five hundred. His integrity in the management of the museum was called in question, but a judicial investigation speedily cleared his honour to the satisfaction even of his accusers.

In 1788 he visited Vesuvius and the volcanoes of the Lipari Islands and Sicily, and embodied the results of his researches in a large work (Viaggi alle due Sicilie ed in alcune parti dell'Appennino), published four years later.

He died from bladder cancer on the 27th of February 1799, in Pavia. After his death, his bladder was removed for study by his colleagues, after which it was placed on public display in a museum in Pavia, Italy, where it remains to this day.

His indefatigable exertions as a traveller, his skill and good fortune as a collector, his brilliance as a teacher and expositor, and his keenness as a controversialist no doubt aid largely in accounting for Spallanzani's exceptional fame among his contemporaries; his letters account for his close relationships with many famed scholars and philosophers, like Buffon, Lavoisier, and Voltaire. Yet greater qualities were by no means lacking. His life was one of incessant eager questioning of nature on all sides, and his many and varied works all bear the stamp of a fresh and original genius, capable of stating and solving problems in all departments of science -- at one time finding the true explanation of stone skipping (formerly attributed to the elasticity of water) and at another helping to lay the foundations of our modern vulcanology and meteorology.

Discoveries

Spallanzani was a Catholic who researched the theory about the spontaneous generation of cellular life in 1768. His experiment suggested that microbes move through the air and that they could be killed through boiling. Critics of Spallazani's work argued his experiments destroyed the "life force" that was required for spontaneous generation to occur. His work paved the way for later research by Louis Pasteur, who defeated the theory of spontaneous generation.

He also discovered and described animal (mammal) reproduction, showing that it requires both semen and an ovum. He was the first to perform in vitro fertilization, with frogs, and an artificial insemination, using a dog. Spallanzani showed that some animals, especially newts, can regenerate some parts of their body if injured or surgically removed.

Spallanzani is also famous for extensive experiments on the navigation in complete darkness by bats, where he concluded that bats use sound and their ears for navigation in total darkness(see animal echolocation). He was the pioneer of the original study of echolocation, though his study was limited to what he could observe. Later scientists moved onto studies of the sensory mechanisms and processing of this information.

His great work, however, is the Dissertationi di fisica animale e vegetale (2 vols, 1780). Here he first interpreted the process of digestion, which he proved to be no mere mechanical process of trituration - that is, of grinding up the food - but one of actual chemical solution, taking place primarily in the stomach, by the action of the gastric juice. He also carried out important researches on fertilization in animals (1780).

See also

References

  1. ^ "Spallanani - Uomo e scienziato" (in Italian). Il museo di Lazzaro Spallanani. http://www-3.unipv.it/webbio/spalla99/spallanz.htm. Retrieved 2010-06-07. 

General

  • Paul de Kruif, Microbe Hunters (2002 reprint) ISBN: 13-9780156027779
  • Nordenskiöld, E. P. 1935 [Spallanzani, L.] Hist. of Biol. 247-248
  • Rostand, J. 1997, Lazzaro Spallanzani e le origini della biologia sperimentale, Torino, Einaudi.

Work on insects

  • Conci, C. & Poggi, R. 1996 Iconography of Italian Entomologists, with essential biographical data. Mem. Soc. Ent. Ital. 75 159-382.
  • Gibelli, V. 1971 L. Spallanzani. Pavia.
  • Lhoste, J. 1987 Les entomologistes français. 1750-1950. INRA (Institut National de la Recherche Agronomique) , Paris.
  • Osborn, H. 1946 Fragments of Entomological History Including Some Personal Recollections of Men and Events. Columbus, Ohio, Published by the Author.
  • Osborn, H. 1952 A Brief History of Entomology Including Time of Demosthenes and Aristotle to Modern Times with over Five Hundred Portraits.Columbus, Ohio, The Spahr & Glenn Company.

External links


Wikispecies

Up to date as of January 23, 2010

From Wikispecies

(1729–1799)

Italian naturalist.








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