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"The US Treasury Dept. and its internal revenue servie uses a series of carefully adjusted hydrometers for determing the amount of alcohol in various distilled liquors."—Finley, 1917

US Internal Revenue hydrometer

"The US Treasury Dept. and its internal revenue servie uses a series of carefully adjusted hydrometers…

A view of the left semilunar from the anterior and internal surfaces.

Left Semilunar

A view of the left semilunar from the anterior and internal surfaces.

"Glands of Sundew magnified. Internal structure." — The Encyclopedia Britannica, 1893

Sundew

"Glands of Sundew magnified. Internal structure." — The Encyclopedia Britannica, 1893