18 ELEMENTARY BOTANY 
and in the Begonia a leaf will root and buds will be produced 
on the blade. Buds of this kind are irregular and abnormal. 
bean seniant It is interesting to see how leaves are arranged 
of Leaves in a bud. ‘The accompanying figure (22) is a 
ao ad drawing of a terminal bud of the Ash cut across 
and drawn from the microscope. | : 
On the outside lie the four outer scales; in the centre are 
two leaves, opposite to each oes and — showing seven 
little leaves. At right 
angles to these are two 
more leaves, each also 
composed of seven leaf- 
lets ; again, at right 
angles to these, two 
more, and so on. Each 
leaflet is bent on itself, 
like the covers of a 
book. In the section 
only seven leaflets are 
seen, although the leat 
of the ash consists of 
‘Fic. 22, TRANSVERSE SECTION OF TER- eleven little leaves ; 
MINAL Bup or ASH. these, lying at different 
levels, will not all be 
cut through ; the outermost leaves, for the same reason, show 
five instead of seven leaflets. 
With this may be compared the Horse- nen bud, which, 
being very large, can be seen without the microscope. ‘The 
terminal bud should be examined early in March before it 
opens. If it is cut across about the middle, the outlines of 
the outer brown and inner green scales are quite clear; then 
follow, in quite a young bud, four green crescent-shaped masses, 
forming, as it were, the four sides of a square. With the help 
of a lens each crescent-shaped mass is seen to be a foliage 
leaf, and in a slightly older bud seven leaflets can be made 
out, all being packed in layer upon layer of wool. Within 
these are the flowers, pinkish in colour. If the outer scales 

