. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. a b c d Fig. 154.—Leaves of the Cratoegoniespili of Bronvaux and their components, a, Mespilus germanica (Medlar); d, Cratcegus monogyna (Whitethorn); b, CraicEQOviespilus Dardari, with two outer layers of medlar cells; c, Cratmgomespilus Asnieresi, with one outer layer of medlar cells. (After Budcr.) the cells in white-edged and green leaves and he found that in a white-edged leaf there is an extra layer of colorless cells in addition to the true epidermis (see Figs. 155, 156 and 157). He conclude
. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. a b c d Fig. 154.—Leaves of the Cratoegoniespili of Bronvaux and their components, a, Mespilus germanica (Medlar); d, Cratcegus monogyna (Whitethorn); b, CraicEQOviespilus Dardari, with two outer layers of medlar cells; c, Cratmgomespilus Asnieresi, with one outer layer of medlar cells. (After Budcr.) the cells in white-edged and green leaves and he found that in a white-edged leaf there is an extra layer of colorless cells in addition to the true epidermis (see Figs. 155, 156 and 157). He concluded that a plant bearing all white- edged leaves must have a complete peripheral layer of the colorless cells just below the epidermis as shown in Fig. 157, a, and that a plant differing. Fig. 155.—Leaves from periclinal chimeras of the white-edged geranium; a, from a plant with two white peripheral cell-layers; h, from a plant with only one epidermal layer of colorless cells. (After Baur.) in this respect from a normal green plant should be considered a peri- clinal chimera. He had observed sectorial chimeras among his geranium seedlings and found that occasionally a plant having some of its leaves entirely green and some of them entirely white would produce a shoot bearing white-edged leaves. He found that such shoots arose near the Digitized by Microsoft®. 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 Babcock, E. B. (Ernest Brown), b. 1877; Clausen, Roy Elwood, 1891-. New York, McGraw-Hill; [etc. , etc. ]
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