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...Evaluation of crude drugs a drug ensure the identity and determines quality purity main reasons behind need for are biochemical variation in effect treatment storage adulterations substitutions organoleptic microscopical chemical physical biological means study using organs senses it refers to methods analysis like colour odour taste size shape special features such as touch texture etc obviously initial sight plant or extract is so specific that tends identify itself if this not enough perhaps has characteristic form morphology while description morphography eg fractured surfaces cinchona quillaia cascara barks quassia wood important characteristics aromatic umbelliferous fruits sweet liquorice wavy rauwolfia pungent capsicum ginger brown cinnamon spice asafoetida black pepper nutmeg caraway cumin diagnostic microscopic method allows more detailed examination can be used organised by their known histological characters mostly qualitative entire powdered forms every possesses tissue fe...