. The microscope and its revelations. Fii;. 5:;5. Granules of starch .isi under polarised light. FIG. 534.—Cells of peony filledwith starch. They are sometimes minute and very numerous, and so closelypacked as to fill the cell-cavity (fig. r>:U) ; in other instances they;m> much larger dimensions, so that only a comparatively smalt them are included in anv one cell; while in other STAKCH-GEAINS 695 cases, again, they are both few and minute, so that they form buta small proportion of the cell-contents. Their nature is at oncedetected by the addition of a solution of iodine, which gives t
. The microscope and its revelations. Fii;. 5:;5. Granules of starch .isi under polarised light. FIG. 534.—Cells of peony filledwith starch. They are sometimes minute and very numerous, and so closelypacked as to fill the cell-cavity (fig. r>:U) ; in other instances they;m> much larger dimensions, so that only a comparatively smalt them are included in anv one cell; while in other STAKCH-GEAINS 695 cases, again, they are both few and minute, so that they form buta small proportion of the cell-contents. Their nature is at oncedetected by the addition of a solution of iodine, which gives them abeautiful blue colour. Each granule when highly magnified exhibitsa peculiar spot, termed the Jiilmn. round which are seen a set ofcircular lines that are for the most part concentric (or nearly so)with it. When viewed by polarised light each grain exhibits a darkcross, the point of intersection being at the hiluni (fig. 535) ; andwhen a selenite plate is interposed the cross becomes beautifullycoloured. Opinions have been ver
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
