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The disease killed an estimated 400,000 Europeans annually during the 19th century and one-third of all the blindness of that time was caused by smallpox. 20 to 60% of all the people that were infected died and 80% of all the children with the infection also died. It caused also many deaths in the 20th century, over 300–500 million.
Changes in relative humidity can cause parchment to change shape, especially if movement is restrained by a frame or mount at certain parts of the object, which leads to uneven distortion. This distortion can result in cockling and destabilization of any pigments affixed to the parchment. [11] Low humidity levels can cause parchment to ...
Parchment is also extremely affected by its environment and changes in humidity, which can cause buckling. Books with parchment pages were bound with strong wooden boards and clamped tightly shut by metal (often brass) clasps or leather straps; [20] this acted to keep the pages pressed flat despite humidity changes. Such metal fittings ...
The history of colonial disease in Hawaii did not end with Captain Cook's diseases. Throughout the 1800s and into the 1900s, Hawaii was hit with many more outbreaks of disease. In 1803, a plague (thought to be yellow fever) came to the islands killing possibly up to 175,000 people. [10]
The germ theory of disease proposes that invisible microorganisms (bacteria and viruses) are the cause of particular illnesses in both humans and animals. [2] Prior to medicine becoming hard science , there were many philosophical theories about how disease originated and was transmitted.
Studies indicate that lead was very prominent in Roman beverages. This is mostly due to the lead-based storage containers that were popular during the time. [6] Some scholars speculate that the levels of alcohol consumed on a daily basis were more to blame for the health ailments of the aristocrats of Rome, with the average consumption rate being approximately 3 bottles of wine a day. [6]
The Broad Street cholera outbreak (or Golden Square outbreak) was a severe outbreak of cholera that occurred in 1854 near Broad Street (now Broadwick Street) in Soho, London, England, and occurred during the 1846–1860 cholera pandemic happening worldwide.
The European potato failure was a food crisis caused by potato blight that struck Northern and Western Europe in the mid-1840s. The time is also known as the Hungry Forties . While the crisis produced excess mortality and suffering across the affected areas, particularly affected were the Scottish Highlands , with the Highland Potato Famine and ...