The endodermal cells of aletris (Plate 35, Fig. 4) are yellowish brown, slightly porous and striated. There are one or two layers of these cells, and two of the smaller cells usually occupy a space similar to that occupied by the radically elongated single cell. On a longitudinal view, the endodermal cells of sarsaparilla triticum, convallaria, and aletris appear as follows: Those of sarsaparilla (Plate 36, Fig. 1) are greatly elongated, the ends of the cells are blunt or slightly pointed, and the walls appear porous and striated. Those of triticum (Plate 36, Fig. 2) are elongated, the walls are porous and striated, and the outer wall is much thinner than the inner wall. The end wall between two cells frequently appears common to the two cells. Those of convallaria (Plate 36, Fig. 3) are elongated, and the end wall is usually blunt. The outer wall is thinner than the inner wall. Those of aletris (Plate 36, Fig. 4) are fibre-like in appearance; the ends of the cells are pointed and the wall is strongly porous. The longitudinal view of these cells is shown in plate 36. HYPODERMAL CELLS =Hypodermal cells= occur in sarsaparilla root and in triticum. In the cross-section of sarsaparilla root (Plate 37, Fig. 1) the hypodermal cells are yellowish or yellowish brown. The outer wall is thicker than the inner wall, and the cell cavity is mostly rounded, and contains air. The walls are porous and finely striated. On longitudinal view, the hypodermal cells of sarsaparilla (Plate 37, Fig. 2) are greatly elongated, and the outer and side walls are thicker than the inner walls. The ends of the cells are blunt and distinct from each other. In cross-section, the hypodermal cells of triticum (Plate 37, Fig. 3) are nearly rounded in outline, and the walls are of nearly uniform thickness. In longitudinal view (Plate 37, Fig. 4) the same cells appear parenchyma-like, and the walls between any two cells appear common to the two cells. [Illustration: PLATE 36 LONGITUDINAL SECTIONS OF ENDODERMAL CELLS 1. Sarsaparilla root (_Smilax officinalis_, Kunth). 2. Triticum (_Agropyron repens_, L.). 3. Convallaria (_Convallaria majalis_, L.). 4. Aletris (_Aletris farinosa_, L.).] [Illustration: PLATE 37 HYPODERMAL CELLS 1. Cross-section sarsaparilla root (_Smilax officinalis_, Kunth). 2. Longitudinal section sarsaparilla root (_Smilax officinalis_, Kunth). 3. Cross-section triticum (_Agropyron repens_, L.). 4. Longitudinal section triticum (_Agropyron repens_, L.).] CHAPTER IV ABSORPTION TISSUE