INTRODUCTORY 5 
seen in occasional examples of the more iden ees species, which 
examples should perhaps have been rred to the subsection 
Rubiginose. I would also call astcakion: a this existence in man 
species of undoubted Hu-canine, and in occasional specimens 
throughout the whole subsection, of minute gland-like organs 
more or less densely scattered all over the under surface, which 
would probably escape attention unless the leaflets are examined 
through a lens under oblique light. Some botanists, to whom 
t 
glands or, if glands, are too small to be of conse quence. 
question at once arises, At what size do they begin to be of impor- 
tance? a question to which I myself cannot supply ananswer. I 
can only say that they appear most commonly in those species 
r part 
e 
and though very rarely seen in the varieties of R. lutetiana, are 
glands (a name suggested by Mr. tails without the more con- 
spicuous stalked glands on the midribs, &c., such as should be found 
i mr varieties. However, so far as know, no author mentions 
the existence of micro-glands, so —— calling attention to their 
existence I make no further commen 
The stze and shape of the leafle ne vary very greatly, and some 
authors have attempted to group the species by means of the size 
of the leaflets, but such an arrangement breaks down. It is 
sufficient to note that some species show a tendency to produce 
large and others small leaflets, but so much depends upon soil 
be stated generally. Some species have a tendency to produce 
elliptical, others suborbicular, leaflets; the bases in one ma 
ro 
prickles, to which I area soothers! called attention. The older 
British authors, down to and rami sg Mr. Baker, have usually 
ee tnguinta between flat and keeled leaflets. Foreign authors 
mention this point, etek may, however, have its impor- 
