B04 MULTIPLICATION. 
the space consequent on the obliquity of the base of 
the leaf. In the other it would seem as if two distinet 
leaves emerged from the stem in juxtaposition. This 


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Fie. 184.—Supernumerary leaf, Ulmus montana. 
is probably due to a lateral chorisis or subdivision of 
the primitive tubercle or growing point, followed by a 
like subdivision of the vascular bundle supplying it. 
There are certain varieties of elm that very generally 
present this anomaly on their rank, coarse, growing 
shoots. In these cases the new growths have the 
same direction as the primary one, but in other cases 
the supplementary production is exactly reversed im 
direction. Thus, in the common hazel (Corylus) a 
second smaller leaf proceeding from the end of the 
leaf-stalk at the base of the primary one may frequently 
be seen. M. Germain de Saint Pierre records an 
instance in a mulberry leaf, from the base of which 
proceeded a large leafy expansion divided into two 
