The Encyclopaedia Britannica; .. A dictionary of arts, sciences and general literature . s, and serve to conveyair. In the proceF of thickening of the cell-wall, if largespaces of the ceil-waU remain thin, and the thickeningmass growing in a circular manner projects into theinterior Qf the cell and gradually arches over the thin portion of cell-wall, a dome-shaped cavity is enclosedbetwixt the thin ceil-waU and the thickening mass. Thegrowing thickening mass graduaOy contracts the openinginto this cavity, but never completely closes it. On frontview this presents the appearance of two concentr
The Encyclopaedia Britannica; .. A dictionary of arts, sciences and general literature . s, and serve to conveyair. In the proceF of thickening of the cell-wall, if largespaces of the ceil-waU remain thin, and the thickeningmass growing in a circular manner projects into theinterior Qf the cell and gradually arches over the thin portion of cell-wall, a dome-shaped cavity is enclosedbetwixt the thin ceil-waU and the thickening mass. Thegrowing thickening mass graduaOy contracts the openinginto this cavity, but never completely closes it. On frontview this presents the appearance of two concentric circles,an outer marking the edge of the original thin portioaof the ceU-wall, and an inner indicating the under edge ofthe gradually contracting ring of thickening matter (fig. 17).When this process takes place on opposite sides of the parti-tion wall between two cells, there are then two similar cavi-ties separated by the thin partition wall of the cells, eachcommunicating freely by a small circular aperture with thercell in which it has been formed (figs. 17 and IS). In process.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectencyclo, bookyear1902
