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Mary the Jewess

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Mary the Jewess was a very important person in the history of science. She was an early alchemist who lived a long time ago. Many people believe she lived in Alexandria between the first and third centuries CE. Alchemy was an early way of studying how things work. Mary is often called the first true alchemist of the Western world. Her ideas helped start a long tradition of chemical study. She viewed the world in a very special way.

Mary's Bath 1528 detail AQ9 (1)
Mary's Bath 1528 detail AQ9 (1)

Mary had many interesting ideas about how metals work. She believed that metals had bodies, souls, and spirits. To her, metals also had two different genders. She thought that joining these two genders could make something new. This was part of her way of seeing the natural world. She also used tools to change how substances behaved. One tool was the kerotakis, which was an airtight container. It used heat to collect vapors from a substance. This tool was meant to copy how gold forms deep inside the Earth.

Mary's Bath 1528 detail AQ9 (1)
Mary's Bath 1528 detail AQ9 (1)

We know about Mary mostly through the writings of others. A man named Zosimos of Panopolis wrote about her in the 4th century. He described her as one of the wise sages. Other writers also mentioned her name over many hundreds of years. An 8th-century writer named George Syncellus called her a teacher. In the 10th century, a book called Kitāb al-Fihrist listed her as a famous alchemist. She was even able to make a purple pigment called caput mortuum.

Mary's Bath 1528 detail AQ9 (1)
Mary's Bath 1528 detail AQ9 (1)

Mary is famous for inventing several tools used in science. One is the tribikos, which is a tool with three arms. It is used for distillation, which is a way to purify liquids. Zosimos said Mary recommended using thick copper for the tubes. She also suggested using flour paste to seal the joints. Another invention is the bain-marie, also known as Mary's bath. This is a double boiler that uses gentle heat. It prevents things from getting too hot by using a separate liquid.

Mary's Bath 1528 detail AQ9 (1)
Mary's Bath 1528 detail AQ9 (1)

Many things we use today come from Mary's early work. You might use a bain-marie in a kitchen to cook food gently. Scientists still use the word "hermetically sealed" because of her airtight tools. This term describes something that is closed very tightly to keep air out. Even the tribikos is still used in chemistry labs today. Her work connects the ancient world to modern science. We can see her influence in how we study chemicals now.

Mary's Bath 1528 detail AQ9 (1)
Mary's Bath 1528 detail AQ9 (1)
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