. The microscope and its revelations. s which separatethe boundaries of the beads, apertures, ortheir equivalents, whatever they may ulti-t mately prove to be; and this is clearly seenwhen they are observed with objectives ofsufficient numerical aperture and propor-tional power. Pleurosigma angulatum isone of the most commonly employed testobjects, and at the same time one of the mostreliable, its remarkable constancy renderingit especially valuable for this purpose;while, on the contrary, Amphiplewra pettuddais extremely variable, and is, as it were, thetorment of microscope-makers and rivaln
. The microscope and its revelations. s which separatethe boundaries of the beads, apertures, ortheir equivalents, whatever they may ulti-t mately prove to be; and this is clearly seenwhen they are observed with objectives ofsufficient numerical aperture and propor-tional power. Pleurosigma angulatum isone of the most commonly employed testobjects, and at the same time one of the mostreliable, its remarkable constancy renderingit especially valuable for this purpose;while, on the contrary, Amphiplewra pettuddais extremely variable, and is, as it were, thetorment of microscope-makers and rivalnot take into account the variability ofthis type, forgetting, in fact, that one maybe extremelyline, and another, being in truth a varietal form, may be nearly ascoarse as X/iriculn rhomboides. The new apochromatic objectives,and the compensating eye-pieces, both for the eye and for by /eiss, of Jena, have brought about such progress inmicrography that the image of /. anyulatwm appears to some minds. Fie;. 443.—Aroolutions inIxfhmia iierrosa. diatom-resolvers, who d< PLATE X.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
