About the year 1827, J. Meyen discovered in the leaves of Ficus elastica, and of several other species belonging to the same genus, certain pedunculate corpuscles, constituted, as he supposed, of gum or of some analogous substance; he ascertained that these corpuscles increased by the superposition of new layers, and that ultimately they became covered with notches and elevations composed of a calcareous, crystalline material, soluble with effervescence in acids (carbonate of lime).

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