Aldrich, Thomas Bailey, 1836-1907 · Boston, CT : Hall and Locke · leaf 205
les;but, imbedded in this matrix, are innumerable bodies, some smaller and some larger,but, on a rough average, notmore than a hundredth of aninch in diameter, having a well-defined shape and structure. Acubic inch of some specimens ofchalk may contain hundreds ofthousands of these bodies,… … On a Piece of Chalk 177 chalk are arranged, and of their relative proportions.But, by rubbing up some chalk with a brush in waterand then pouring off the milky fluid, so as to obtainsediments of different degrees of fineness, the granulesand the minute rounded bodies may be pretty wellseparated…
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