x ribs, three to each. This diversity in number is thus
explained:--A circle of vascular tissue ran round the interior of the
calyx-tube, at its junction with the limb, and at the point of insertion
of the petals and stamens. The vascular circle seemed to be formed from
the confluence of the ten ribs from below. Of the five ribs in each half
of the calyx, the three central ones were joined together just at the
point of confluence with the vascular circle, above which they formed
but a single rib--that traversing the centre of the carpellary leaf; the
two lateral ribs of each half of the calyx seemed to be continuous,
above the vascular rim, with the lateral ribs of the carpel; these
lateral ribs were connected on either side with the central one by short
branches of communication. The disposition of the ten ribs may be thus
represented:--

1 1 1 1 1 1
3 2 3 2 3 3 2 3 2 3
1 1 1 1 1 1 1 1 1 1

The lower line of figures represents the calycine ribs, the middle row
shows how each of these ribs is divided at the vascular rim, and the
uppermost row shows their distribution above the rim. From this it will
be seen that six of the calycine ribs divide into three branches, one
prolonged upwards as a lateral or median rib into the carpellary leaf,
the other running horizontally to join with similar branches sent out
from the neighbouring rib; the four intermediate calycine ribs divide
into two branches only, which join the side branches of the first
mentioned, but have no direct upward prolongation into the carpel. The
ten ridges are placed opposite to the sepals and petals.

[126] 'Neue Denkschriften der allgemeine Schweizerischen Gesellschaft,'
band 5. 1841. tab. 2.

[127] Bell Salter, 'Gard. Chron.,' March 13th, 1847, and 'Ann. Nat.
Hist.,' 1847, vol. xix, p. 471. &c.

[128] 'The Origin and Production of Proliferous Flowers, with the
Culture at large for raising Double Flowers from Single, and Proliferous
from the Double.' By J. Hill, M.D. London, 1759.

[129] A. de Candolle, 'Neue Denkschriften,' op. cit., p. 9; also Unger
as cited in 'Botanical Gazette,' May, 1351. p. 70.

[130] Duchartre, op. cit.

[131] 'Ann. Sc. Nat.,' 1844, vol. i, p. 297.

[132] Maout, 'Lecons Elementaires de Botanique,' vol. ii. p. 488;
Ferrari. 'Hesperides.' pls. 271, 315, 405.

[133] Moquin-Tandon, loc. cit., p. 386, &c.; see also Trecul, in the
'Bull. Soc. Bot. France,' to