Aldrich, Thomas Bailey, 1836-1907 · Boston, CT : Hall and Locke · leaf 63
diatoms.Examined under the microscope, thousands of minuteflint shields of various shapes are seen. This rock, orearth, is very abundant in many places, and is some-times used as a poHshing powder. In Bohemia thereis a layer of it no less than fourteen feet thick. Yetso minute are the shells of… … If you examine carefully a piece of coal, you willfind, more or less clearly, markings hke those which are seen in a piece ofwood. Sometimes they arevery distinct indeed. Coalabounds in impressions ofleaves, ferns, and stems,and fossil remains of plantsand tree-trunks are found innumbers in…
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