. Elements of applied microscopy. A text-book for beginners. Microscopy. MICROSCOPY OF PAPER. lOI , or oval scar-like pits arranged in regular rows over their surface. In the case of pine, lattice-like areas with ob- long openings appear at intervals; but the presence of long cells mainly of a single type and with discoid mark- ings is the characteristic of the Conifers in general. 7. The Structure of the Angiosperms.—Pulp made from the commoner Angiospermous trees shows two distinct elements, long narrow fibres and short broad. Fig, 40.—^Tracheid of Birch. (After Herzberg.) 240 diameters. cel
. Elements of applied microscopy. A text-book for beginners. Microscopy. MICROSCOPY OF PAPER. lOI , or oval scar-like pits arranged in regular rows over their surface. In the case of pine, lattice-like areas with ob- long openings appear at intervals; but the presence of long cells mainly of a single type and with discoid mark- ings is the characteristic of the Conifers in general. 7. The Structure of the Angiosperms.—Pulp made from the commoner Angiospermous trees shows two distinct elements, long narrow fibres and short broad. Fig, 40.—^Tracheid of Birch. (After Herzberg.) 240 diameters. cells with .characteristic markings. The two species most in use for cheap grades of paper are poplar and birch; the longer fibres are very similar in both, having a central canal of variable width and ends sometimes rounded and sometimes tapering to a point. The more thin-walled of these fibres often show rounded and oval pores penetrating the wall. Smaller fibres with. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Winslow, C. -E. A. (Charles-Edward Amory), 1877-1957. New York, J. Wiley; London, Chapman & Hall
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