The microscope and its revelations . Tissne of the Testa of the seed-coat of Star-Anise:—A, as seen in section; b, as seen on thesurface. E E 418 MICROSCOPIC STRUCTURE OF PHANEROGAMIC PLANTS. as concentric rings when the cells coutaining them are cutthrough; and these layers are sometimes so thick and nume-rous, as almost to obliterate the original cavity of the a continuance of the same arrangement as that whichshows itself in the single layer of the dotted cell,—eachdeposit being deficient at certain points, and these pointscorresponding with each other in the successive layers,—aser
The microscope and its revelations . Tissne of the Testa of the seed-coat of Star-Anise:—A, as seen in section; b, as seen on thesurface. E E 418 MICROSCOPIC STRUCTURE OF PHANEROGAMIC PLANTS. as concentric rings when the cells coutaining them are cutthrough; and these layers are sometimes so thick and nume-rous, as almost to obliterate the original cavity of the a continuance of the same arrangement as that whichshows itself in the single layer of the dotted cell,—eachdeposit being deficient at certain points, and these pointscorresponding with each other in the successive layers,—aseries of passages is left, by which the cavity of the cellis extended at some points to its membranous wall; andit commonly happens that the points at which the deposit iswanting on the walls of two contiguous cells, are coincident,so that the membranous partition is the only obstacle to thecommunication between their cavities (Figs. 154-156). It isof such tissue that the stones of fruit, the gritty substance Fig. 155. Fig. Section of Cherry Stone, cuttingthe cells transversely. Section of Coquilla Nid, in thedirection of the long diametersof the cells. which surrounds the seeds and forms little hard points in thefieshy substance of the pear, the sheU of the cocoa-nut, andthe albumen of the seed of Fhytelephas (known as vegetableivory), are made-up; and we see the use of this very curiousarrangement, in permitting the cells, even after they haveattained a considerable degree of consolidation, still to remain i SPIRAL CELLS. 419 ^T^
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