VASCULAR SYSTEMS OF FLORAL ORGANS. 163 
again on passing up the outer wall of the ovarian cell, forming a 
very curious arrangement as seen ina transverse section. It may 
be the means of supplying the hypertrophied tissue of the gland 
with nourishment; but the gland itself is only an expansion of 
the superficial tissue at the base of the ovary. 
With inferior ovaries the glandular structure is mostly the base 
of the styles, as in Umbellifere and Caprifoliacee, or the exposed 
part of the summit of the ovary, as in Ivy, or both may assist in 
the formation of it. A curious case is the septal glands of some 
Monocotyledons (rvir. 10*; rx. 3; Pl. XXXII). These arise 
from a partial differentiation of the two epidermides of the walls 
of the carpels in contact, which together constitute a septum of 
the ovary T. 
I have elsewhere described what appears to me to be a probable 
origin of glands, namely the irritation set up by insect agencies ; 
so will refer the reader to my work on * Origin of Floral Struc- 
tures,’ chap. xvi. p. 140. 
DESCRIPTION OF FIGURES. 
ORDERS AND GENERA ILLUSTRATED. 
I. RANvNCULACEX.— I. Clematis (p. 165; PI. AXTELL). m 
Anemone (p. 165; Pl. XXIIL). 111. Ranunculus (p. 165; 
Pl. XXIIL). 1v. Eranthis (p. 166; Pl. XXIII.). 
II. PAPAVERACE®.—V. Papaver (p. 166; Pl. XXIL) Xt 
Eschscholtzia (p. 167; Pl. XXIII.) 
II. Crvcırer2.—vır. Cheiranthus (p. 168; PI. XXIV.). 
IV. VioLacez.—vıu. Viola (p. 169; PI. XXIV.). 
V. Resepacex.—ix. Reseda (p. 169; PI. XXIV.). 
VI. CARYOPHYLLE®.— x. Dianthus ip. 170; PI. XXIV). xi. 
Silene (p. 170; PL XXV.). xu Lychnis (p. 171; 
PE XXV.) 
VIL MarLvacez.—xr1. Malva (p. 173; Pl. XXV) 
VIII. Hyrertcrnen.—xiv. Hypericum (p. 173; Pl. XXVI.). 
IX. GERANTACEE.—XV. Geranium (p. 174; Pl. AAN) IVL 
Erodium (p. 175; Pl. XXVL). xvir. Pelargonium 
(p. 175; Pl. XXVI). xvir. Tropæolum (p. 177; Pl. 
XXV). 
t See Mr. E. H. Acton’s paper, * On the Formation of Sugars in the Septal 
Glands of Narcissus,” Ann. of Bot. vol. ii. p. 53. 
