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Organic chemistry also posed problems in the discrimination between substances. Berzelius originally devoted his career to physiological chemistry, a field based upon the application of chemistry and physiology to substances derived from animals and plants. To that end, he mastered traditional extractive analysis and published papers on these analyses between 1806 and 1808 that became highly regarded by his peers. However, he found that extractive analysis provided no fundamental insight into organic matter, since its products were not distinct substances but, rather, mixtures of broadly similar compounds. Meanwhile, his interest in organic composition was overshadowed by his forays into mineral ...(100 of 2129 words)