Silica deposition in plant material is usually studied by examining epidermal peels. These peels are obtained either by working with a razor (Prat, 1932) or by using a macerating fluid like sulphuric acid and potassium dichromate (Suryanarayana and Krishnaswamy 1948; Parry and Smithson, 1958) and mounting them in Canada-balsamphenol mixture. A better method of studying the arrangement of silica deposits in situ is by 'spodograms', which are mounted ashed material on glass slides (Uber, 1940). The evolution of spodograms and the latest methods have been detailed in this paper.
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