The microscope and its revelations . 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^. permeable to tlie fluid requii-ed for the nu
The microscope and its revelations . 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^. permeable to tlie fluid requii-ed for the nutrition of the partswhich such tissue encloses and protects. 228. The deposit sometimes assumes, however, the form ofde^mte Jib res, wliich lie coiled-up in the interior of cells, so asto form a single, a double, oreven a triple or quadruple Fig. 157. spire (). Such spii-alcells are found most abun-dantly in the leaves of certainOrchideous plants, immediatelybeneath the cuticle, where theyare brought into view by verticalsections; and they may be ob-tained in an isolated state,by macerating the leaf andpeeling-off the cuticle, so asto expose the layer beneath,which is then easily sepa-rated into its components. Inan Orchideous plant named Sac- colahium guttatum^We spiral cells are unusuallvlong, and havespires winding in opposite directions; so that, lay their mutualintersection, a series ofdiamond-shaped mark-ings is produced. Spiralcells areoften found uponthe surface of the testa orouter coat of seeds; andin the Collomia grandi-Jlo
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
