Jan Baptista Van Helmont
1580-1644
Belgian Alchemist/Chemist and Physician
Jan Baptista van Helmont played an important role in the transition from classical and medieval ideas and practices to those of modern science, especially in the fields of chemistry and biology. He is considered the founder of scientific pathology and the father of biochemistry.
Helmont received the M. D. degree in 1609 at Louvain. The ideas of the Swiss physician and alchemist Paracelsus (1493-1541) dominatedthe teaching of medicine at this time. Alchemy, a forerunner of chemistry, assumed the existence of a substance, known as the philosopher's stone, which could transform common metals into gold. Its practice combined mysticism (religious belief in reality beyond normal human perception) with pragmatic chemistry and astrology (belief that the stars and planets influence human action and health) to address various problems such as the prediction of events and the treatment of illnesses.
Helmont was firmly rooted in the alchemical tradition. For instance, he proposed that an agent, which he called archeus, functions as an alchemist within the body. This archeus, he believed, has a body and a soul and causes diseases by imagining them. Also, unlike Paracelsus, who believed that the human body was composed of salt, sulfur, and mercury, Helmont held that the body is made up of water, and that, indeed, water is the basic element from which all living matter is formed.
He, however, was able to move beyond this medieval context. He was an attentive observer and was the first to employ quantitative and experimental methods in biological and physiological problems. He was first to apply chemistry systematically to biological processes, studying such phenomena as digestion and nutrition from a chemical point of view, i.e. as resulting from the interaction of chemical substances. As an example, he used alkaline compounds to treat the pain caused by an excess of stomach acids. As a result of this groundbreaking work, he is regarded as the founder of biochemistry.
He also applied his method of deliberate observation to diseases, attempting to correlate diseases with their causes. His systematic approach placed such study on a scientific basis, and consequently he is considered to be the founder of the scientific discipline of pathology.
He was first to perceive fully that the substance known simply as air is not made up of a single entity but is composed of a number of substances. Noting that these substances have the ability to fill any space made available to them, he modified the Greek word for space, chaos, and invented the name gas. He also pointed out that gases are generated in various chemical processes. He discovered the gas carbon dioxide and showed that it is produced both in the burning of coal and in the fermentation process of winemaking. His ideas formed the basis of the work of Robert Boyle (1627-1691) who is regarded as the founder of modern chemistry.
In his effort to apply quantitative methods to his observations and experiments, Helmont was the first to use the boiling point and melting point of water as standard points for a temperature scale, thereby increasing the accuracy of temperature measurements.
During the period of history in which Helmont lived and worked, the world moved significantly away from the philosophy and the technology of the middle ages, a period also known appropriately as the dark ages. Although a product of the past and a participant in its beliefs and practices, Helmont's reliance on careful observation and quantitative experimentation led to significant contributions to the body of scientific methods and ideas which subsequently developed into the dramatic change in thought and practice known as the scientific revolution.
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