James Hyslop, Head of Scientific Instruments, Globes and Natural History at Christie's, demonstrates the Darwin Family Microscope, owned and used by the English naturalist and founder of the concept of evolution, Charles Darwin, which will be offered at auction as part of Christie's Classic Week, London, Britain, October 14, 2021. A microscope Charles Darwin gave his son Leonard and which has remained in the family for nearly 200 years is headed for auction in December, and is expected to fetch up to $480,000. REUTERS/Toby Melville

James Hyslop, Head of Scientific Instruments, Globes and Natural History at Christie's, demonstrates the Darwin Family Microscope, owned and used by the English naturalist and founder of the concept of evolution, Charles Darwin, which will be offered at auction as part of Christie's Classic Week, London, Britain, October 14, 2021. The instrument was designed by Charles Gould for the firm Cary around 1825 and is one of six surviving microscopes associated with the British naturalist, according to auction house Christie's. REUTERS/Toby Melville

James Hyslop, Head of Scientific Instruments, Globes and Natural History at Christie's, demonstrates the Darwin Family Microscope, owned and used by the English naturalist and founder of the concept of evolution, Charles Darwin, which will be offered at auction as part of Christie's Classic Week, London, Britain, October 14, 2021. The date of its manufacture coincides with the time when Darwin was studying zoophytes, organisms such as coral and sea anemone. REUTERS/Toby Melville

James Hyslop, Head of Scientific Instruments, Globes and Natural History at Christie's, demonstrates the Darwin Family Microscope, owned and used by the English naturalist and founder of the concept of evolution, Charles Darwin, which will be offered at auction as part of Christie's Classic Week, London, Britain, October 14, 2021. The microscope will be offered at Christie's Valuable Books & Manuscripts auction on Dec. 15, and has a price estimate of 250,000 - 350,000 pounds. REUTERS/Toby Melville

James Hyslop, Head of Scientific Instruments, Globes and Natural History at Christie's, demonstrates the Darwin Family Microscope, owned and used by the English naturalist and founder of the concept of evolution, Charles Darwin, which will be offered at auction as part of Christie's Classic Week, London, Britain, October 14, 2021. REUTERS/Toby Melville

James Hyslop, Head of Scientific Instruments, Globes and Natural History at Christie's, demonstrates the Darwin Family Microscope, owned and used by the English naturalist and founder of the concept of evolution, Charles Darwin, which will be offered at auction as part of Christie's Classic Week, London, Britain, October 14, 2021. REUTERS/Toby Melville