The induction, development, and heritability of fasciations . secondary bundle-ring, b^,., in the pith. c. Connection of secondary bundle-ring with the primary ring. d. Fusion of the same. e. Beginning of formation of protuberance at k. f. Protuberance cut off, /. Series 3. O. biennis. Development of ring-fasciation. X 25. a. Appearance of a single meristem, in. b. Development of supplementary meristems, //Zj, ;«.,, ;//;,, etc. c. Differentiation of meristems into ring of secondary bundle-groups, b-^ , b.,, A,, etc. d. Appearance of lysigenous cavity, ca. e. Gradual fusion of secondary bundle-
The induction, development, and heritability of fasciations . secondary bundle-ring, b^,., in the pith. c. Connection of secondary bundle-ring with the primary ring. d. Fusion of the same. e. Beginning of formation of protuberance at k. f. Protuberance cut off, /. Series 3. O. biennis. Development of ring-fasciation. X 25. a. Appearance of a single meristem, in. b. Development of supplementary meristems, //Zj, ;«.,, ;//;,, etc. c. Differentiation of meristems into ring of secondary bundle-groups, b-^ , b.,, A,, etc. d. Appearance of lysigenous cavity, ca. e. Gradual fusion of secondary bundle-groups. Inner epidermis, ep.,; inner cortex, cx<.: outer phloem of secondary ring, ph-^; inner phloem of secondary ring,///,,• xvlem,;,; pith,//./. Break in side of ring, making a flat 4. O. biennis. Four stages of the development of a specimen intermediatebetween Series i and 3. i\a corresponds with y. The secondary bundle-ringarises in the middle and passes to the side, where it fuses with the primaryring. X 20. Knox. Plate 20 INDUCTION, DEVELOPMENT, AND HERITABILITY OF FASCIATIONS. Description of Plate V. [Drawn with an Abbe catueru lucida and reduced to one-third of given magnifications. I Figs i, 2, 3. Transverse sections of stems of O. biennis. Successive stages in the earlydevelopment of a groove-fasciation. Meristem, ;//,• thick-walled parenchyma,pp; medullary parenchyma, ;;/^; cambium, c; outer phloem of primary bundlering,///,; inner phloem of same ring, ^Z/^. Fig. i shows the lowest section ofthe meristem (plate iv, fig. \a). The dark shading in the meristem indicatesintercellular secretions. At .r the cambium has been destroyed. X 430. Fig. 2. Drawing of meristems in plate iv, fig. \b. Two meristems {>n-^,/;) appear in thebreak in the ring. X 430. Fig. 3. Drawing of two groups of secondary bundles, showing first differentiation ofvessels. Secondary bundle-groups, b^, X 560. Fig. 4. O. cniciata. Diagram of longitudinal se
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