The microscope and its revelations . Portion of transverse section of large stem ofConiferous Wood (fossil), showing- part of twoannual layers, divided at a, a, and traversed byvery thin but numerous MeduUary Eays. Fig. 171. Portion of vertical section of the samewood, taken in a radial direction, showingthe glandular woody fibres, without ducts,crossed by the MeduUary Eays, a, a. Fr2 Portion of vertical section ofthe same wood, taken in a tan-gential du-ection, so as to cutacross the Medullary Eays, 436 MICROSCOPIC STRTJCTTJRE OP PHANEROGAMIC PLANTS. intervene (Figs. 166-169); and their real
The microscope and its revelations . Portion of transverse section of large stem ofConiferous Wood (fossil), showing- part of twoannual layers, divided at a, a, and traversed byvery thin but numerous MeduUary Eays. Fig. 171. Portion of vertical section of the samewood, taken in a radial direction, showingthe glandular woody fibres, without ducts,crossed by the MeduUary Eays, a, a. Fr2 Portion of vertical section ofthe same wood, taken in a tan-gential du-ection, so as to cutacross the Medullary Eays, 436 MICROSCOPIC STRTJCTTJRE OP PHANEROGAMIC PLANTS. intervene (Figs. 166-169); and their real nature is bestunderstood by a comparison of longitudinal sections made intwo diiferent directions,—namely, radial and tangential^,—?with the transverse. Three such sections of a fossil Coniferouswood in the Authors possession are shown in Eigs. stem was of such large size, that, in so small a part ofthe area of its transverse section as is represented in Eig. 170,the medullary rays seem to run parallel to each other, insteadof radiating from a common centre. They are very narrow;but are so closely set-together, that only two or three rows ofwoody fibres (no ducts being here present) intervene betwee
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
