A practical course in botany : with especial reference to its bearings on agriculture, economics, and sanitation . Fig. 140. — Sections of sycamore wood : a, tangential; h, radial;c, cross. {From Pinchot, U. S. Dept. of Agr.). Fig. 141. —Section ofU. S. Dept. of Agr.) {From Pinchot, that the medullary rays appear as silvery bands or plates(Figs. 140, 141). This is because the cut runs parallel tothem. It is the medullary rays chiefly that give to commer-cial woods their characteristic graining. Knots, buds, andother adventitious causes also influence it in various The swelling and
A practical course in botany : with especial reference to its bearings on agriculture, economics, and sanitation . Fig. 140. — Sections of sycamore wood : a, tangential; h, radial;c, cross. {From Pinchot, U. S. Dept. of Agr.). Fig. 141. —Section ofU. S. Dept. of Agr.) {From Pinchot, that the medullary rays appear as silvery bands or plates(Figs. 140, 141). This is because the cut runs parallel tothem. It is the medullary rays chiefly that give to commer-cial woods their characteristic graining. Knots, buds, andother adventitious causes also influence it in various The swelling and shrinking of timber. — The ca-pacity possessed by certain substances of bringing about an THE STEM 123
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