. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. 106 PLANT PHYSIOLOGY II going from direct illumination, as in the ordinary microscope, to dark field without changing condensers. A special dark-field condenser is manufactured by Bausch and Lomb which m Itself takes the form of a moist chamber; it has been designed for work in microdissection. The Spierer lens The Spierer lens (26, 28), an ingenious development of dark-field illumi- nation (o, fig. 5), is based on the principle that a colloidal particle scatters X
. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. 106 PLANT PHYSIOLOGY II going from direct illumination, as in the ordinary microscope, to dark field without changing condensers. A special dark-field condenser is manufactured by Bausch and Lomb which m Itself takes the form of a moist chamber; it has been designed for work in microdissection. The Spierer lens The Spierer lens (26, 28), an ingenious development of dark-field illumi- nation (o, fig. 5), is based on the principle that a colloidal particle scatters XA\.V\.\-T ^. y^M^^MW/A V////^^/^/W///. ^ riG. 5. The optical system of a Spierer lens: 0 = objective m = Spierer mirror 1 = lens = reflected rays = scattered rays e = cover slip f = material g = slide c = cardioid condenser d = diaphragm a = aperture for direct rays = direct rays for Spierer lens b = slot for cardioid condenser rays = cardioid condenser rays light unevenly, , there are more rays given off in one direction than in any other, namely, from that side which is away from the source of illumi- -rtS- v >*' ^ 1 >, « * T i> p J • -<pn %. 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 University of Pennsylvania. Botanical Laboratory; University of Pennsylvania. Morris Arboretum. Philadelphia : [s. n. ]
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Keywords: ., bookcentury1900, bookpublisherphiladelphiasn, booksubjectbotany
