THE ROOT. 
eS ER fF) 
Sa 
WOR 
Td 
Ww 
, 
FIG. 2.—Diagram of a Dicotyledon [from Sachs]. I. and II. embryonic stages; III. after 
germination ; w, primary root; w’, w’, secondary roots (developing endogenously and 
acropetally) ; h, hypocotyl; ¢, c, cotyledons ; B, b’, b”, b’”, leaves (developing exogenously 
and acropetally) ; &, k’, k’, axillary buds. 
Growing points, and vascular bundles, black; 
the parts becoming elongated, grey. Root-caps white. 
15 
