This jar was made and used between 1830 and 1870. It was used to store leeches which were used in a medical procedure called bloodletting: as many as fifty leeches were applied to their body, falling off when they were filled with blood.
Use our 3D leech jar model in the classroom to bring your curriculum teaching to life: https://learning-resources.sciencemuseum.org.uk/resources/leech-jar
Find our more in the Science Museum Group online collection: https://collection.sciencemuseumgroup.org.uk/objects/co80769/pharmacy-leech-jar-leech-jar