Jan Swammerdam

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Jan Swammerdam
erythrocytes, work on entomology
Scientific career
FieldsEntomology

Jan or Johannes Swammerdam (February 12, 1637 – February 17, 1680) was a Dutch biologist and microscopist. His work on

egg, larva, pupa, and adult—are different forms of the same animal. As part of his anatomical research, he carried out experiments on muscle contraction. In 1658, he was the first to observe and describe red blood cells. He was one of the first people to use the microscope
in dissections, and his techniques remained useful for hundreds of years.

Education

Oudeschans, drawing by Jan de Beijer

Johannes Swammerdam was baptized on 15 February 1637 in the

insects from around the world. In 1632 he married Baartje Jans (-1660) in Weesp.[1] The couple lived across the Montelbaanstoren, near the harbour, the headquarter and the warehouses of the Dutch West India Company where an uncle worked. Some of their children were buried in the Walloon church, likewise Jan himself (who never married) and his father.[2]

As a youngster, Swammerdam had helped his father to take care of his

Niels Stensen. While studying medicine Swammerdam started his own collection of insects.[3]

In 1663 Swammerdam moved to France to continue his studies. It seems together with Steno.

dissections and published their findings. Between 1666 and 1667 Swammerdam concluded his study of medicine at the University of Leiden; he received his doctorate in medicine in 1667 under van Horne for his dissertation on the mechanism of respiration, published under the title De respiratione usuque pulmonum.[3]

Together with van Horne, he researched the anatomy of the uterus. The result of this research was published under the title Miraculum naturae sive uteri muliebris fabrica in 1672. Swammerdam accused Reinier de Graaf of taking credit of discoveries he and Van Horne had made earlier regarding the importance of the ovary and its eggs. He used waxen injection techniques and a single-lens microscope made by Johannes Hudde.

Research into insects

While studying medicine Swammerdam had started to dissect insects and after qualifying as a doctor, he focused on them. His father pressured him to earn a living, but Swammerdam persevered and in late 1669 published Historia insectorum generalis ofte Algemeene verhandeling van de bloedeloose dierkens (The General History of Insects, or General Treatise on little Bloodless Animals). The treatise summarised his study of insects he had collected in France and around Amsterdam. He countered the prevailing Aristotelian notion that insects were imperfect animals that lacked internal anatomy.[3] Following the publication his father withdrew all financial support.[5] As a result, Swammerdam was forced, at least occasionally, to practice medicine in order to finance his own research. He obtained leave at Amsterdam to dissect the bodies of those who died in the hospital.[6]

Illustration of a mosquito from Historia

At university Swammerdam engaged deeply in the religious and philosophical ideas of his time. He categorically opposed the ideas behind spontaneous generation, which held that God had created some creatures, but not insects. Swammerdam argued that this would blasphemously imply that parts of the universe were excluded from God's will. In his scientific study, Swammerdam tried to prove that God's creation happened time after time, and that it was uniform and stable. Swammerdam was much influenced by René Descartes, whose natural philosophy had been widely adopted by Dutch intellectuals. In Discours de la Methode Descartes had argued that nature was orderly and obeyed fixed laws, thus nature could be explained rationally.[7]

Swammerdam was convinced that the creation, or generation, of all creatures obeyed the same laws. Having studied the reproductive organs of men and women at university he set out to study the generation of insects. He had devoted himself to studying insects after discovering that the king

Cosimo III de' Medici, accompanied by Thévenot, another revolutionary discovery. Inside a caterpillar the limbs and wings of the butterfly could be seen (now called the imaginal discs
).

When Swammerdam published The General History of Insects, or General Treatise on little Bloodless Animals later that year he not only did away with the idea that insects lacked internal anatomy but also attacked the Christian notion that insects originated from spontaneous generation and that their life cycle was a metamorphosis.[9] Swammerdam maintained that all insects originated from eggs and their limbs grew and developed slowly. Thus there was no distinction between insects and so-called higher animals. Swammerdam declared war on "vulgar errors" and the symbolic interpretation of insects was, in his mind, incompatible with the power of God, the almighty architect.[10] Swammerdam, therefore, dispelled the seventeenth-century notion of metamorphosis —the idea that different life stages of an insect (e.g. caterpillar and butterfly) represent different individuals[11] or a sudden change from one type of animal to another.[12]

Miraculum naturae sive uteri muliebris fabrica

Spirituality

Swammerdam suffered a crisis of conscience; his father repudiated the study of insects. Having believed that his scientific research was a tribute to the Creator, he started to fear that he may be worshipping the

Nicolaus Steno, but was back in Amsterdam in early 1676. In a letter to Henry Oldenburg, he explained "I was never at any time busier than in these days, and the chief of all architects has blessed my endeavors".[13]

Bybel der natuure

Bybel der Natuure, 1693

His religious crisis only interrupted his scientific research briefly and until his premature death aged 43, he worked on what was to become his main work. It remained unpublished when he died in 1680 and was published as Bybel der natuure posthumously in 1737 by the Leiden University professor

bees and many other insects. His scientific observations were infused by the presence of God, the almighty creator.[16] Swammerdam's praise of the louse
went on to become a classic:

Herewith I offer you the Omnipotent Finger of God in the anatomy of a louse: wherein you will find miracle heaped on miracle and see the wisdom of God clearly manifested in a minute point.[7]

Research on bees

Swammerdam's drawing of the queen bee's reproductive organs, as observed through the microscope.

Since ancient times it had been asserted that the queen bee was male, and ruled the hive. In 1586 Luis Mendez de Torres had first published the finding that the hive was ruled by a female, but Torres had maintained that she produced all other bees in the colony through a "seed". In 1609 Charles Butler had recorded the sex of drones as male, but he wrongly believed that they mated with worker bees. In Biblia naturae the first visual proof was published that his contemporaries had mistakenly identified the queen bee as male.[17] Swammerdam also provided evidence that the queen bee is the sole mother of the colony.[18]

Swammerdam had engaged in five intense years of

Giacomo Filippo Maraldi in his 1712 book.[20] Details of Swammerdam's research on bees had already been published elsewhere because he had shared his findings with other scientists in correspondence. Among others, Swammerdam's research had been referenced by Nicolas Malebranche in 1688.[13]

Research on muscles

Swammerdam's illustration of a nerve-muscle preparation. He placed a frog thigh muscle in a glass syringe with a nerve protruding from a hole in the side of the container. Irritating the nerve caused the muscle to contract, but the level of the water, and thus the volume of the muscle, did not increase.

In Biblia naturae Swammerdam's research on muscles was published. Swammerdam played a key role in the debunking of the

ventricles of the brain, through the nerves, and to the muscles to animate the latter.[21] According to this hypothesis, muscles would grow larger when they contract because of the animal spirits flowing into them. To test this idea, Swammerdam placed severed frog thigh muscle in an airtight syringe with a small amount of water in the tip.[21] He could thus determine whether there was a change in the volume of the muscle when it contracted by observing a change in the level of the water (image at right).[21] When Swammerdam caused the muscle to contract by irritating the nerve, the water level did not rise but rather was lowered by a minute amount; this showed that no air or fluid could be flowing into the muscle.[21] The idea that nerve stimulation led to the movement had important implications for neuroscience by putting forward the idea that behavior is based on stimuli.[21]

Swammerdam's research had been referenced before its publication by Nicolas Steno, who had visited Swammerdam in Amsterdam. Swammerdam's research concluded after Steno had published the second edition of Elements of Myology in 1669, which is referenced in Biblia naturae.[22] A letter from Steno to Malpighi from 1675 suggests that Swammerdam's findings on muscle contraction had caused his crisis of consciousness. Steno sent Malpighi the drawings Swammerdam had done of the experiments, saying "when he had written a treatise on this matter he destroyed it and he has only preserved these figures. He is seeking God, but not yet in the Church of God."[23]

Legacy

Amsterdam Oudeschans 18 detail
Amsterdam Oudeschans 18 top

Together with his father he collected 6,000 objects in 27 drawer cabinets. Swammerdam's Historia insectorum generalis was widely known and applauded before he died. Two years after his death in 1680 it was translated into French and in 1685 it was translated into Latin.

snowflakes and the anatomy of the human eye.[13] An English translation of his entomological works by T. Floyd was published in 1758.[6]

No authentic portrait of Jan Swammerdam is extant nowadays.[24] The portrait shown in the header is derived from the painting The Anatomy Lesson of Dr Tulp by Rembrandt and represents the leading Amsterdam physician Hartman Hartmanzoon (1591–1659).

Notes

  1. ^ "Jan Jacobsz. Swammerdam". Archived from the original on 2023-05-19. Retrieved 2023-05-19.
  2. ^ Scheltema, Pieter (1863). Aemstel's oudheid of gedenkwaardigheden van Amsterdam (in Dutch). Scheltema. pp. 103–107.
  3. ^
    ISBN 9789004100060
    .
  4. ^ "Het 'Boeck der Natuere' (2006) by Eric Jorink, p. 231". Archived from the original on 2023-05-20. Retrieved 2023-05-20.
  5. ^
    ISBN 9789004100060
    .
  6. ^
    The American Cyclopædia
    .
  7. ^
    ISBN 9789047422365
    .
  8. ^ "Het 'Boeck der Natuere' (2006) by Eric Jorink". Archived from the original on 2023-05-20. Retrieved 2023-05-20.
  9. ISBN 9789047422365
    .
  10. ISBN 9789047422365
    .
  11. ^ "...whereas modern biologists speak of the grub, the pupa and the adult as stages in the life cycle of one individual butterfly, Harvey and his contemporaries always regarded the grub as one individual and the butterfly as another."Elizabeth B. Gasking (1966). Investigations Into Generation 1651–1828. Baltimore: The Johns Hopkins University Press. page 30
  12. ISBN 1-59691-036-4
    .
  13. ^
    ISBN 9789047422365
    .
  14. ^ Swammerdam, Jan. 1737-1758. Bybel der natuure Archived 2020-12-09 at the Wayback Machine. Amsteldammer. Of Historie der insecten
  15. ISBN 9789004100060
    .
  16. ISBN 9789047422365
    .
  17. ISBN 9780226020860
    .
  18. ^
    ISBN 9780415924672
    .
  19. ISBN 9780226020860
    .
  20. ISBN 9780415924672
    .
  21. ^ a b c d e f g Cobb M (2002). "Timeline: Exorcizing the animal spirits: Jan Swammerdam on nerve function" (PDF). Nature Reviews Neuroscience. 3 (5): 395–400.
    S2CID 5259824. Archived from the original
    (PDF) on 2005-05-15.
  22. ISBN 9780871698414
    .
  23. ISBN 9780871698414
    .
  24. ^ "Jan Swammerdam's "portrait"". Archived from the original on 22 October 2013. Retrieved 22 January 2013.

Works

References

Further reading

  • Jorink, Eric. "'Outside God there is Nothing': Swammerdam, Spinoza, and the Janus-Face of the Early Dutch Enlightenment." The Early Enlightenment in the Dutch Republic, 1650–1750: Selected Papers of a Conference, Held at the Herzog August Bibliothek Wolfenbüttel, 22–23 March 2001. Ed.
    Wiep Van Bunge
    . Leiden, The Netherlands: Brill Academic Publishers, 2003. 81–108.
  • Fearing, Franklin. "Jan Swammerdam: A Study in the History of Comparative and Physiological Psychology of the 17th Century." The American Journal of Psychology 41.3 (1929): 442–455
  • Ruestow, Edward G. The Microscope in the Dutch Republic: The Shaping of Discovery. New York: Cambridge University Press, 1996.
  • Ruestow, Edward G. "Piety and the defense of natural order: Swammerdam on generation." Religion Science and Worldview: Essays in Honor of Richard S. Westfall. Eds. Margaret Osler and Paul Lawrence Farber. New York: Cambridge University Press, 1985. 217–241.

External links

New International Encyclopedia article about "Jan Swammerdam
".
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