. Elements of scientific and practical agriculture : or, The application of biology, geology, and chemistry to agriculture and horticulture. Kant. t Whewell. DEFINITIONS AND DESCRIPTIONS. 31. Fig. 3. 5. Cells are of three kinds.(1) Those of the bark and pith,of an elhpsoidal form. (2) Elon-gated cells of tlie liber aiul wood.Tliese cells constitute the in-terior of the hark, and are thebasis of wood]) fibre. (3) Cellsof the medullarrj rays. Themedullary rays pass from thepitii to the bark through thewood, as in Fig. 2. c m m m.These cells also have intercel-lular canals. 6. Spiral vessels exis
![. Elements of scientific and practical agriculture : or, The application of biology, geology, and chemistry to agriculture and horticulture. Kant. t Whewell. DEFINITIONS AND DESCRIPTIONS. 31. Fig. 3. 5. Cells are of three kinds.(1) Those of the bark and pith,of an elhpsoidal form. (2) Elon-gated cells of tlie liber aiul wood.Tliese cells constitute the in-terior of the hark, and are thebasis of wood]) fibre. (3) Cellsof the medullarrj rays. Themedullary rays pass from thepitii to the bark through thewood, as in Fig. 2. c m m m.These cells also have intercel-lular canals. 6. Spiral vessels exis Stock Photo](https://c8.alamy.com/comp/2AFT8XM/elements-of-scientific-and-practical-agriculture-or-the-application-of-biology-geology-and-chemistry-to-agriculture-and-horticulture-kant-t-whewell-definitions-and-descriptions-31-fig-3-5-cells-are-of-three-kinds1-those-of-the-bark-and-pithof-an-elhpsoidal-form-2-elon-gated-cells-of-tlie-liber-aiul-woodtliese-cells-constitute-the-in-terior-of-the-hark-and-are-thebasis-of-wood-fibre-3-cellsof-the-medullarrj-rays-themedullary-rays-pass-from-thepitii-to-the-bark-through-thewood-as-in-fig-2-c-m-m-mthese-cells-also-have-intercel-lular-canals-6-spiral-vessels-exis-2AFT8XM.jpg)
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. Elements of scientific and practical agriculture : or, The application of biology, geology, and chemistry to agriculture and horticulture. Kant. t Whewell. DEFINITIONS AND DESCRIPTIONS. 31. Fig. 3. 5. Cells are of three kinds.(1) Those of the bark and pith, of an elhpsoidal form. (2) Elon-gated cells of tlie liber aiul wood.Tliese cells constitute the in-terior of the hark, and are thebasis of wood]) fibre. (3) Cellsof the medullarrj rays. Themedullary rays pass from thepitii to the bark through thewood, as in Fig. 2. c m m m.These cells also have intercel-lular canals. 6. Spiral vessels exist also in the more i)erfect plants.They are called spiral because they are fibres twistedlike a cork-screw, (Fig. 3, ) around an empty space.These cells occur only in wood, and are found in bun-dles. Each bundle contains about thirty or forty spi-ral tubes. A new bundle is formed every year, con-stituting the annual layer of icood, or concentric rings, as in Fig. 2. They are supi)osed to be air vessels. Ingrasses and grains these spiral vessels constitute thepart around the interior of the hollow stem. 7. Pores are oblique openings or slits in the epider-mis or cuticle, so small tJiat a