The induction, development, and heritability of fasciations . o the stem for a distanceof 6 mm. This tree was growing in a particularly favorable location inthe wash at the west base of Tumamoc Hill. The following measurements were made: Species. Diameterof branch. Outer cortical band. Penetrationof chloro-phyll. Depth. Width. P. aculeata mm. 7 M •s; M 96083 130144 ^^^ 160144176160196224 ?) 2 5 Do ,o Do II-515 32-5498o8 lO12-5 14411216013016064969696128 Do Do Do Do P. torreyana Do. Do Do Do. 26 TOPOGRAPHY OF CHLOROPHYLL APPARATUS IN DESERT VELUTI
The induction, development, and heritability of fasciations . o the stem for a distanceof 6 mm. This tree was growing in a particularly favorable location inthe wash at the west base of Tumamoc Hill. The following measurements were made: Species. Diameterof branch. Outer cortical band. Penetrationof chloro-phyll. Depth. Width. P. aculeata mm. 7 M •s; M 96083 130144 ^^^ 160144176160196224 ?) 2 5 Do ,o Do II-515 32-5498o8 lO12-5 14411216013016064969696128 Do Do Do Do P. torreyana Do. Do Do Do. 26 TOPOGRAPHY OF CHLOROPHYLL APPARATUS IN DESERT VELUTINA. (Figs. 12, 13, and 14.) Prosopis vehdina is the most characteristic tree of the river-bottoms, wherein places it forms extensive forests. It varies in size from a small shrubto a well-formed and shapely tree 15 m. or more higfh. The difference insize depends mainly on the lack or the abimdance of the are fomied in the sprint- and arc shed in the autumn witli a ^u-larity characteristic of deciduous trees of more humid CD- •.<?•? Fig. 12.—Prosopis veliitina: A, transverse section of stem 4 mm. in diameter,to show distribution of chlorophyll; 5, segment from cortex of stem 7 diameter, to show relation of hard bast (h. b.) to chlorophyll. The sections of branches studied were cut at nine separate intervalsfrom 3 cm. to m. from the tips, and were from mm. to cm. indiameter. In several particulars the distribution of chlorophyll in Prosopis recallsthat in Parkinsonia. In the young stem chlorophyll maybe found in prac-tically all of the g-round-tissue both of cortex and of wood. With increasein size the chlorophyll distribution of the stem becomes greatly restrictedand the topography of the chlorophyll apparatus becomes much general structural relations of the stem will be apparent from the suc-ceeding accoimt of the distribution of the chlorophyll and will not requireespecial discussion. The epidermal cel
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