The document summarizes the history and discoveries of the lymphatic system from ancient times to the 17th century. It describes how Hippocrates first mentioned lymph nodes, while Herophilos incorrectly believed lymph vessels drained into the liver. Galen further described lacteals and lymph nodes through animal dissections. Later discoveries identified the thoracic duct and proved lacteals do not terminate in the liver. The 17th century saw acceptance of blood recirculation and naming of lymphatic vessels. Galen's ideas of blood production were eventually disproven.