THE FRUIT ee 
a drop of strong sulfuric acid is added, a carmine-red color will 
be observed showing the presence of vanillin in this region. A 
number of closed collateral bundles will be seen coursing through 
the mesocarp. 
3. ENDocarpP, an irregular line of inner epidermal cells which 
is differentiated into two regions, the interplacental region and the 
placental region. ‘The interplacental (inner) epidermis shows its 
cells elongated into numerous thin-walled glandular hairs which 
contain an abundance of balsam; the placental region covers the 
six bifid placente which extend into the cavity of the capsule. _ Its 
(inner) epidermis is composed of mucilaginous cells. 
Fic. 234.—Photomicrograph of a transverse section of a mericarp of Feniculum 
vulgare, showing epicarp (A), mesocarp (B), endocarp (F), vitta (C), endosperm 
of seed (D), carpophore (G) and fibro-vascular bundle in primary rib (Z). (Highly 
magnified.) 
4. SeEps.—These are minute blackish bodies attached to the 
placental twigs of the placentae. Some of them may have been 
torn off in cutting the section. ; 
HistoLocy oF A TypicAL MERICARP, Fa@nicuLuM.—This 
five-angled fruit, in transverse section, shows a concave com- 
missural and convex dorsal surface. Passing from the surface 
toward the center we note: 
1. Epicarp, or outer covering tissue, composed of colorless 
epidermal cells and small stomata. ‘The epidermal cells in cross- 
section appear rectangular, while in surface view they are both 
polygonal and rectangular. 
2. Mesocarp, of several layers of thin-walled, colorless, 
isodiametric cells, beneath which are two to several additional 
