SPIRAL VESSELS. 
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which are unrolled, and occasionally, as represented by 
Fig. 86, b, you may see very fine examples of the 
compound spiral vessels before alluded to, as many as 
FIG. 86. 
a, simple spiral vessel from petal of Anagallis ; b, compound spiral vessel 
from Canna bicolor ; c d ef g h, portions of spiral vessels of Canna bicolor 
having longitudinal as well as transverse striae ; i, branching spiral vessels 
from the stem of a Leek. 
six coils forming a band ; I have, however, in some 
cases, counted as many as twenty-two. Spiral vessels 
not unfrequently branch ; this fact is well seen in 
the specimen taken from the flowering stem of the 
Leek , and represented by i, in Fig. 86. 
In all these examples, it may be observed that the 
H 2 
