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Preventive Medicine [7]:![Preventive Medicine [7]](img/preventive-medicine-[7]-.jpg) Harden was born in Manchester, England, on Oct. 12, 1865. He studied at Owens College in Manchester under Henry Roscoe and then went to Erlangen, Germany, to study with Otto Fischer for his Ph. D. degree. On his return to Manchester, Harden collaborated with Roscoe in writing a study of John Dalton's notebooks, as well as on chemical textbooks. In 1897, Harden went to the Jenner Institute of Preventive Medicine in London.
Above all, increasingly dense populations of animals have to be kept healthy. Consequently, the role of the veterinary profession is now very important and the veterinarian must be an expert in preventive medicine [7] as well as the diagnosis and treatment of clinical disease when it appears. The history of stock farming in Europe is punctuated by recurrent attacks of plagues and "murrains" (infectious diseases in animals) that are now controlled by closing frontiers, strict quarantine and in some diseases slaughtering of the affected animals and their contacts [8].
Thus, it reached an estimated 100 million by 1200 A. D., but fell to 65 million by 1368 at the end of the Yuan (Mongol) dynasty. It mounted to 150 million by 1600, but natural disaster and famine reduced it to 100 million by 1680. The population soared to an estimated 430 million by 1800, but a 15-year period of famine, banditry, and rebellions left only 380 million. By the mid-1960's decreased mortality rates resulting from modern preventive medicine caused the population to reach its new high of about 750 million people. |
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