The induction, development, and heritability of fasciations . A.— KdBERLINIA SPINOSA. Branch from a plant which is situated on the old Road along the bottom land of the Santa Cruz River. Nov. 8, I 906. B.— FRANSERIA DUMOSA. An entire plant taken from the northern slope of theTumamoc Hill. April 25, 1907. Franseria is an evergreen. FRANSERIA DUMOSA. 17 as follows: The epidermis has a relatively thin cuticle. At a distance cm. from the tip its contents are colorless, but in the older parts a darkpurple pigment is present. As previously mentioned, multicellular hairsand other hairs
The induction, development, and heritability of fasciations . A.— KdBERLINIA SPINOSA. Branch from a plant which is situated on the old Road along the bottom land of the Santa Cruz River. Nov. 8, I 906. B.— FRANSERIA DUMOSA. An entire plant taken from the northern slope of theTumamoc Hill. April 25, 1907. Franseria is an evergreen. FRANSERIA DUMOSA. 17 as follows: The epidermis has a relatively thin cuticle. At a distance cm. from the tip its contents are colorless, but in the older parts a darkpurple pigment is present. As previously mentioned, multicellular hairsand other hairs occur; these are to be found most abundant, perhaps, whereno pigment is present in the epidermis. The secretion from these hairs,which is soluble in chloroform and ether, is so copious as to nearly sub-merge them, and covers the stem as far as the location of cork. The cortex. Fig. 7.—Franseria dumosa: A,transverse section of stem in diameter, showinggeneral distribution of chloro-phyll; 5,detail of A, to showcharacter of cortical chloren-chyma; C, secreting hair fromyoung part of stem, to showpresence of chlorophyll, whichis indicated by stippling, onperiphery of cells. The cellsof the epidermis do not con-tain chlorophyll. in stems mm. in diameter and 5 cm. from the tip is composed of fourwell-defined tissues, which, enumerated from without, are collenchyma,parenchyma, hard bast, and soft bast. The collenchymatous and the par-enchymatous portions are chlorophyll-bearing; some chlorophyll may alsobe found in the ground-tissue between the hard bast and the parenchyma exterior to the hard bast contains chlorophyll and is madeup of cuboid cells with large intercellular spaces. 18 TOPOGRAPHY OF CHLOROPHYLL IN DESERT PLANTS. Except in the very yoiing-est branches, /. i\, those less than mm. indiameter, no chlorophyll o
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