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Freezing microtome, London, England, 1883-1885

Invented in 1881, this type of freezing microtome used ice and salt to freeze animal and plant specimens to be sliced for microscope slides. Ice and salt were replaced by a removable ether spray in 1883. Freezing hardened and preserved the specimens’ structure quickly. Chemical preservation usually took six weeks but by using ether the process took a matter of seconds. Once frozen, a razor, operat…