THE ROOT. 15 
i) pe » 
YH 
UY WAY Hi) 
Ur At Ha 
i iy, y 
: 
( 
A 
a =" 
J ( 
ANON 
rence 
I 
Ww 
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Fig. 2.—Diagram of a Dicotyledon (from Sachs]. I. and II. embryonic stages; III. after 
' germination ; w, primary root; w’, 2’, secondary roots (developing endogenously and 
acropetally) ; h, hypocotyl; ¢, c, cotyledons ; b, b’, b”, b’’, leaves (developing exogenously 
and acropetally) ; k, k’,k’, axillary buds. Growing points, and vascular bundles, black; 
the parts becoming elongated, grey. Root-caps white. 
