Cherry Gum
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
Cherry gum is a natural plant gum exuded from fruit tree trunks that forms a viscous solution in water. In microscopy, it was used to slow down the movement of highly active free-living protozoa, such as infusoria, to facilitate observation.
Encyclopedia entry (1928–1936)
CHERRY GUM, Cerasin, a gum exuding from the trunks of fruit trees and solidifying into a yellowish translucent mass, dissolves in water to form a thick syrup. In microscopic technique, cherry gum is used when observing highly motile, free-living protozoa, especially infusoria, for the purpose of slowing down their movements, for which a drop of cherry gum solution is added to a drop of the fluid under investigation.
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“Cherry Gum.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/cherry-gum/