Americans Walter Reed and James Carroll demonstrated that mosquitoes carry the virus responsible for yellow fever. Brazilian scientist Carlos Chagas identified a tropical disease and its vector. With the onset of the Industrial Revolution, residing requirements amongst the working population began to worsen, with cramped and unsanitary urban conditions. In the first four decades of the nineteenth century alone, London’s population doubled and even higher progress rates have been recorded within the new industrial cities, similar to Leeds and Manchester.
Thomas Malthus warned of the hazards of overpopulation in 1798. His ideas, in addition to those of Jeremy Bentham, turned very influential in government circles in the early years of the 19th century.
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