ComradeHuxley
Donor
The Discovery of Electricity
Herophilos the Medical Pioneer
"When health is absent, wisdom cannot reveal itself, art cannot manifest, strength cannot fight, wealth becomes useless, and intelligence cannot be applied."
Herophilus
Herophilos was born in Chalcedon in Asia Minor, 335 BC (1). Not much is known about his early life other than that he had moved to Alexandria at a fairly young age to begin his schooling. His formal medical education began under Praxagoras of Cos, who had added to Aristotelian anatomy by differentiating arteries from veins and who first measured the pulse, using a water clock (clepsydra), thus pioneering objective measurements in medicine.
As an adult Herophilos was a teacher, and an author of at least nine texts ranging from his book titled, On Pulses, which explored the flow of blood from the heart through the arteries, to his book titled Midwifery. Herophilos was the first scientist to systematically perform scientific dissections of human cadavers.
Corpses were generally considered sources of both physical and God-inflicted pollution (stoutly denied by Hippocrates), hence the traditional Greek taboo that banned human dissection. However, for a period of 40 years, Ptolemaic royal patronage permitted dissection of condemned criminals probably to expand understanding of disease and hence the repute of Alexandria as the foremost site of scholarship. After Alcmaeon (6th century BC), Herophilus was probably the first person to dissect human cadavers, numbering about 600. He believed the primary parts of the human body should be perceptible to the senses, following the principles of the Hippocratic school On the Nature of Man, probably the work of Polybus, Hippocrates' son-in-law.
Conventional medicine of the time revolved around the theory of the four humors in which an imbalance between bile, black bile, phlegm, and blood led to sickness or disease. Veins were believed to be filled with blood and a mixture of air and water. Through dissections, Herophilos was able to deduce that veins only carried blood. After studying the flow of blood, he was able to differentiate between arteries and veins. He noticed that as blood flowed through arteries, they pulsed or rhythmically throbbed. He worked out standards for measuring a pulse and could use these standards to aid him in diagnosing sicknesses or diseases.
Praxagoras, his teacher, from the school of Cos was renowned for his studies of the pulse. Herophilus supported him, maintaining that pulsation was involuntary and the result of the contraction and dilatation of the arteries caused by contraction and dilatation of the heart . But, based on his own observation, he opposed Praxagoras's opinion of the ‘cardiocentric' dictates of Aristotle. Herophilus stated that the brain not the heart was the seat of the soul. As his friend Erasistratus, "he places the dominant principle of the soul in the ventricles of the brain".
His work on blood and its movements led him to study and analyse the brain. He proposed that the brain housed the intellect rather than the heart, a return to the "encephalaocentrism". He was the first person to differentiate between the cerebrum and the cerebellum and to place individual importance on each portion. He looked more in depth into the network of nerves located in the cranium. He described the optic nerve and the oculomotor nerve for sight and eye movement. Atlhough here again Alcmaeon of Croton had done a lot of groundwork(2).
Through his dissection of the eye, he discovered the different sections and layers of the eye: the cornea, the retina, the iris, and the choroid also known as the choroid coat. Further study of the cranium led him to describe the calamus scriptorius which he believed was the seat of the human soul. Analysis of the nerves in the cranium allowed him to differentiate between nerves and blood vessels and to discover the differences between motor and sensory nerves. He believed that the sensory and motor nerves shot out from the brain and that the neural transmissions occurred by means of pneuma.
Part of his belief system regarding the human body involved the pneuma, which he believed was a substance that flowed through the arteries along with the blood. Playing off of medical beliefs at the time, Herophilos stated that diseases occurred when an excess of one of the four humors impeded the pneuma from reaching the brain.
Thales and Socrates’s Thought on Magnetism
Herophilos' discovery of electricity was inspired by two other famous Greek thinker, Thales of Miletus and Socrates of Athen.
Aristotle, the major source for Thales's philosophy and science, identified Thales as the first person to investigate the basic principles, the question of the originating substances of matter and, therefore, as the founder of the school of natural philosophy. Thales was interested in almost everything, investigating almost all areas of knowledge, philosophy, history, science, mathematics, engineering, geography, and politics. He proposed theories to explain many of the events of nature, the primary substance, the support of the earth, and the cause of change.
Magnetic iron ore could be found near “Magnesia on the Maeander” in Asia Minor. Thales himself collected such rocks. “ho magnetes lithos” or lodestone. However none of his original manuscripts detailing his observations survived to the present day. The best source we have are the writings of Aristotle:
“And Thales, according to what is related of him, seems to have regarded the soul as something endowed with the power of motion, if indeed he said that the loadstone has a soul because it moves iron. [De Anima, by Aristotle]
This was certainly an important inspiration for Herophilos and his musings about the nature of the pneuma. However even more important was the following observation Socrates made. "that stone not only attracts iron rings, but imparts to them a similar power of attracting other rings; and sometimes you may see many pieces of iron and rings suspended from one another to form quite a long chain; and all of them derive their power of suspension from the original stone"
Somehow it seemed that pneuma, magnetism or however one wanted to call this invisible force could be transported trough metal, like blood that flows trough the body.
Notes and Sources
(1) I try to keep dates, and technical terms mostly as they are used in our timeline. Evertything else would probably be too confusing in the long term. The only exception are “text” passages cited from sources written in this timeline. One example would be me quoting Herophilos.
(2) Alcmaeon of Croton experimented with live animals by cutting the nerve behind the eye to study vision. He also contributed to the study of medicine by establishing the connection between the brain and the sense organs, and outlined the paths of the optic nerves as well as stating that the brain is the organ of the mind. However, his theories were not without mistakes. He said that sleep occurs when blood vessels in the brain are filled and that waking is caused by the emptying of these vessels. He also stated that the eye contains both fire and water.
Wikipedia: Herophilos, Thales, Alcmaeon
http://www.iep.utm.edu/thales/
http://blogs.bu.edu/ggarber/archive/bua-py-25/magnetism/
http://www.mlahanas.de/Greeks/ElectroMagnet.htm
The Neuroanatomy of Herophilus by Pearce J.M.S.
People
Herophilos of Chalcedon (335 BCE – 280 BCE)
Thales of Miletus (624 BCE – 546 BCE)
Socrates of Athen (470 BCE – 399 BCE)
Herophilos the Medical Pioneer
"When health is absent, wisdom cannot reveal itself, art cannot manifest, strength cannot fight, wealth becomes useless, and intelligence cannot be applied."
Herophilus
Herophilos was born in Chalcedon in Asia Minor, 335 BC (1). Not much is known about his early life other than that he had moved to Alexandria at a fairly young age to begin his schooling. His formal medical education began under Praxagoras of Cos, who had added to Aristotelian anatomy by differentiating arteries from veins and who first measured the pulse, using a water clock (clepsydra), thus pioneering objective measurements in medicine.
As an adult Herophilos was a teacher, and an author of at least nine texts ranging from his book titled, On Pulses, which explored the flow of blood from the heart through the arteries, to his book titled Midwifery. Herophilos was the first scientist to systematically perform scientific dissections of human cadavers.
Corpses were generally considered sources of both physical and God-inflicted pollution (stoutly denied by Hippocrates), hence the traditional Greek taboo that banned human dissection. However, for a period of 40 years, Ptolemaic royal patronage permitted dissection of condemned criminals probably to expand understanding of disease and hence the repute of Alexandria as the foremost site of scholarship. After Alcmaeon (6th century BC), Herophilus was probably the first person to dissect human cadavers, numbering about 600. He believed the primary parts of the human body should be perceptible to the senses, following the principles of the Hippocratic school On the Nature of Man, probably the work of Polybus, Hippocrates' son-in-law.
Conventional medicine of the time revolved around the theory of the four humors in which an imbalance between bile, black bile, phlegm, and blood led to sickness or disease. Veins were believed to be filled with blood and a mixture of air and water. Through dissections, Herophilos was able to deduce that veins only carried blood. After studying the flow of blood, he was able to differentiate between arteries and veins. He noticed that as blood flowed through arteries, they pulsed or rhythmically throbbed. He worked out standards for measuring a pulse and could use these standards to aid him in diagnosing sicknesses or diseases.
Praxagoras, his teacher, from the school of Cos was renowned for his studies of the pulse. Herophilus supported him, maintaining that pulsation was involuntary and the result of the contraction and dilatation of the arteries caused by contraction and dilatation of the heart . But, based on his own observation, he opposed Praxagoras's opinion of the ‘cardiocentric' dictates of Aristotle. Herophilus stated that the brain not the heart was the seat of the soul. As his friend Erasistratus, "he places the dominant principle of the soul in the ventricles of the brain".
His work on blood and its movements led him to study and analyse the brain. He proposed that the brain housed the intellect rather than the heart, a return to the "encephalaocentrism". He was the first person to differentiate between the cerebrum and the cerebellum and to place individual importance on each portion. He looked more in depth into the network of nerves located in the cranium. He described the optic nerve and the oculomotor nerve for sight and eye movement. Atlhough here again Alcmaeon of Croton had done a lot of groundwork(2).
Through his dissection of the eye, he discovered the different sections and layers of the eye: the cornea, the retina, the iris, and the choroid also known as the choroid coat. Further study of the cranium led him to describe the calamus scriptorius which he believed was the seat of the human soul. Analysis of the nerves in the cranium allowed him to differentiate between nerves and blood vessels and to discover the differences between motor and sensory nerves. He believed that the sensory and motor nerves shot out from the brain and that the neural transmissions occurred by means of pneuma.
Part of his belief system regarding the human body involved the pneuma, which he believed was a substance that flowed through the arteries along with the blood. Playing off of medical beliefs at the time, Herophilos stated that diseases occurred when an excess of one of the four humors impeded the pneuma from reaching the brain.
Thales and Socrates’s Thought on Magnetism
Herophilos' discovery of electricity was inspired by two other famous Greek thinker, Thales of Miletus and Socrates of Athen.
Aristotle, the major source for Thales's philosophy and science, identified Thales as the first person to investigate the basic principles, the question of the originating substances of matter and, therefore, as the founder of the school of natural philosophy. Thales was interested in almost everything, investigating almost all areas of knowledge, philosophy, history, science, mathematics, engineering, geography, and politics. He proposed theories to explain many of the events of nature, the primary substance, the support of the earth, and the cause of change.
Magnetic iron ore could be found near “Magnesia on the Maeander” in Asia Minor. Thales himself collected such rocks. “ho magnetes lithos” or lodestone. However none of his original manuscripts detailing his observations survived to the present day. The best source we have are the writings of Aristotle:
“And Thales, according to what is related of him, seems to have regarded the soul as something endowed with the power of motion, if indeed he said that the loadstone has a soul because it moves iron. [De Anima, by Aristotle]
This was certainly an important inspiration for Herophilos and his musings about the nature of the pneuma. However even more important was the following observation Socrates made. "that stone not only attracts iron rings, but imparts to them a similar power of attracting other rings; and sometimes you may see many pieces of iron and rings suspended from one another to form quite a long chain; and all of them derive their power of suspension from the original stone"
Somehow it seemed that pneuma, magnetism or however one wanted to call this invisible force could be transported trough metal, like blood that flows trough the body.
Notes and Sources
(1) I try to keep dates, and technical terms mostly as they are used in our timeline. Evertything else would probably be too confusing in the long term. The only exception are “text” passages cited from sources written in this timeline. One example would be me quoting Herophilos.
(2) Alcmaeon of Croton experimented with live animals by cutting the nerve behind the eye to study vision. He also contributed to the study of medicine by establishing the connection between the brain and the sense organs, and outlined the paths of the optic nerves as well as stating that the brain is the organ of the mind. However, his theories were not without mistakes. He said that sleep occurs when blood vessels in the brain are filled and that waking is caused by the emptying of these vessels. He also stated that the eye contains both fire and water.
Wikipedia: Herophilos, Thales, Alcmaeon
http://www.iep.utm.edu/thales/
http://blogs.bu.edu/ggarber/archive/bua-py-25/magnetism/
http://www.mlahanas.de/Greeks/ElectroMagnet.htm
The Neuroanatomy of Herophilus by Pearce J.M.S.
People
Herophilos of Chalcedon (335 BCE – 280 BCE)
Thales of Miletus (624 BCE – 546 BCE)
Socrates of Athen (470 BCE – 399 BCE)
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