PO WDERED I)R UOS. 
299 
116. Cinnamomum. — (See No. 99.) 
117. Coffee.— Brownish ; characteristic fragments of 
seed-coat made up of parenchyma and spindle-shaped 
stone cells 175 to 200 y long and 35 y wide; composed 
mostly of the cells of endosperm, these having brown- 
ish-colored porous walls, 10 y thick, and containing 
oil, aleurone and starch. The ground coffee of the 
market is either made from the true coffee seed or is 
an artificial mixture of cereals, chicory, etc. 
118. Sassafras. — Light brown; bast fibers thick- 
walled, lignified, usually single or not more than two 
or three together ; starch grains 7 to 20 y in diameter, 
single or two to three-compound ; parenchymatous 
cells with irregular masses of tannin ; oil globules 
numerous. The stem bark contains groups of bast 
fibers and stone cells, and the parenchymatous cells 
contain chloroplastids. 
2. SCLERENCH YMATOUS FIBERS WANTING. 
* STONE CELLS PRESENT, 
f Giving Tannin Reaction with Ferric Salts. 
119. Cacao. — Reddish brown; consisting chiefly of pro- 
tein grains and oil; starch grains 4 to 8 y in diameter ; 
fragments with brownish contents (cacao red); fat 
crystals in little prisms or needles ; few fragments of 
seed-coat consisting of hexagonal epidermal cells, a 
peculiar mucilage layer of small tabular cells and a 
layer of nearly isodiametric stone cells (10 x 10 y), 
the walls of which are 4 y thick. 
120. Guarana. — Dark brown ; parenchyma thin- 
walled, containing nearly spherical, more or less 
altered starch grains 10 y in diameter ; sclerenchy- 
matous cells nearly isodiametric, non-lignified ; scle- 
renchymatous fibers few, narrow ; ducts few, narrow', 
annular or scalariform. 
