they have been made by Mr. Mueller, a glass worker, under the direction of Dr. Dahlgren, of theDepartment of Preparation. Aside from the impossi-bility of distinguishing or even seeing many of theseorganisms with the naked eye, the glass models exhibitthe form, structure, and color far better than… … Studying a Specimen Through the Microscope.
Portland · Cement · Exhibit · Munn · Louis · Portland cement · Scientific American · Trunk pacific · Ten years · American august · Average speed · War department · Typewriting machine · Glass models · Grand trunk
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