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Muter, according to the appearance they give under the microscope, into five groups: Class I. Hilum and concentric rings visible. All the granules, oval or ovate. Tous-le-mois, potato, arrowroot, etc. Class II. The concentric rings are all but invisible, the hilum is stellate. Maize, pea, bean, etc. Class III. The concentric rings are all but invisible, also the hilum in the majority of granules.
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