LEAVES. 93 
That a compound leaf, in spite of the joints of the separate 
leaflets, is really only one leaf, is shown: (1) by the absence 
of buds-in the axils of leaflets ; (2) by the arrangement of the 
blades of the leaflets horizontally, without any twist in their 
individual leafstalks ; (5) by the fact that their arrangement 
Fic. 76. — Pinnately Compound Leaf of Locust, with Spines for Stipules. 
on the midrib does not follow any of the systems of leaf 
arrangement on the stem ($ 122). If each leaflet of a com- 
pound leaf should itself become compound, the result would 
be to produce a twice compound leaf. Fig. 85 shows that of 
an acacia. 
