170 REV. PROF. G. HENSLOW ON THE 
VI. CARYOPHYLLEA (Pls. XXIV., XXV .).— Tribe Sileneæ. 
X. DIANTHUS BARBATUS.—ÅN oval ring of cords in the pedicel 
sends off two pairs of cords for the bracts (1). The rest then 
close up for the ealyx (2) ; for this, ten principal cords are given 
off (3 and 4, s.) ; and the ring closes up again, forming a sub- 
pentagonal arrangement (4). This now provides five isolated 
cords for the sepaline stamens (5, s.s/.), and the five petals are 
separated off nearly at the same time (5, p.) ; so that another 
pentagon is left. Between this and the petals is the cellular disk 
(7, D). Each petaline cord subsequently gives rise to a staminal 
(6, a and b). 
The central pentagon now contraets (7), changes its form, and 
breaks up into four masses, arranged in an oval manner (8). The 
two nearest the centre divide into four (9, 10), of which two 
coalesce and form a central placentary group (10, 11, 12, pl.), 
at whieh period the ovarian cavities appear (10-12, ov.). Hence 
the axis has now become extinct. Four cords are now isolated 
on the circumference, two being dorsal and two situated at the 
ends of the septum (11). The dorsal also multiply by radial 
chorisis and give rise to smaller cords (11). The central cluster 
now becomes cruciate (12) in order to supply branches to the 
four placentas corresponding to the four margins of the two 
earpels of the pistil (13). 
XL. SILENE INFLATA (Pl. XXV.)—There are five cords in the 
pedicel of a flower of this plant. It furnishes a case in which 
the pericycle is particularly well seen. It is indicated by a 
circular band in fig. 1. The cords increase till a complete circle 
is formed. This gives off five strong cords and five smaller ones 
opposite to the petals for the calyx (2). These rapidly divide 
into twenty ; the remainder close up into a pentagonal prism (3), 
which now separates into two series of five each, the cords assum- 
ing a horseshoe shape (4) The outer cords supply the five 
petais (5, p.), each of which gives rise to a staminal cord (5, p.st.); 
the cords of the five calycine stamens having also appeared (5, 
s.st.). A central ring is left: this breaks up into three large 
placentary cords and three smaller dorsal ones (6) alternating in 
position, just as in Reseda (ix. 5-7). The three larger (7, pl.) 
close up, approach the centre, and gradually become fused together, 
having the trachex scattered about the middle of the phloém (8). 
The latter finally arrange themselves into three radiating lines 
