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50:1 ·
A sign for retort, alembic or distillery tube. It also sometimes was used to symbolize the process of distillation.
A retort or alembic was a glass vessel with a long, tapering, down-angled neck or beak, used for heating up liquids and letting the gas out via the beak into a cooled flask for condensation. Retort was also drawn  and  in alchemy.
The process of distillation could be drawn  , the ideogram for the zodiac sign of Virgo.
See the two sections on alchemy in Part III for data about the distillation process in the alchemists' program.
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