178 REY. PROF. G. HENSLOW ON THE 
making five, 7. e. two petaline and three sepaline, which are now 
united by lateral branches (4). Two small cords are given off 
from the circle to supply the ale or wings. 
Figure 5 represents a section between the petals and stamens. 
The central cord has trifurcated, so that there are five branches in 
the vexillum (5, vex.). These ultimately increase to nine (6, 
vex.). The same figure (5) also shows the bases of the three 
cords on the posterior side belonging to the vexillum. Two cords 
are now present for each ala, connected by loops; while two cords 
will appear on the anterior side, destined for the carina or keel 
petals. 
The oval remaining in the middle will supply the ten stamens 
and one carpel. How figure 6 is arrived at may be best seen 
from the following sections of flowers of other genera, where 
the process is the same (ef. Lorus (xxr. 4-8), Prsum (xx11. 
3-6). 
XX. CERCIS SILIQUASTRUM.—The flower of this tree is remark- 
able for the entire freedom of its stamens. This is readily 
accounted for by the extraordinary large size of the honey-disk 
(D), which forms an oval ridge indented with ten sinuses, in each 
of which a stamen stands freely. They are therefore well 
apart, and can develop perfectly independent of cach other. 
XXI. Lorus CORNICULATUS.— Figure 1 represents a section of 
a peduncle. Groups of cords finally separate to supply the 
pedicels of the umbels (2). Though they are at first horseshoe- 
shaped, they soon become circular (3). The circle now throws 
off ten cords for the sepals and petals with scarcely any pro- 
nounced irregularity and without the cemplications seen in 
Cytisus (xix. 4). The stamens are given off, and a broken ring 
remains in the centre (5), a crescent-shaped cavity appearing on 
the anterior side for the honey-disk. This increases while the 
two halves of the broken circle give rise to dorsal and placentary 
cords respectively (6). The stamens, though diadelphous in the 
fully developed flower, are, as in Pisum (xxrr. 5 and 6), mona- 
delphous at first (7). The tenth stamen becomes free by the 
atrophy of the tissue on either side of it (10). 
XXII. LATHYRUS ODORATUS (lettered Pisum odoratum).—A dif- 
ference in the method of supplying cords to the whorls will be 
observed in figures 1-4; in that a section, such as figure 3, shows 
that the cords branch very rapidly ; consequently the cords for 
all four whorls are seen simultaneously instead of in succession. 
