TROPAOLUM PEREGRINUM AND T. SPECIOSUM. 233 
lateral and an anterior one, 7.¢., in line with the interval between the two ante- 
rior sepals. In a fifth there is a single supernumerary anterior spur, almost 
wholly turned inside out, and very small. The séxvth case had one introverted 
spur, but unfortunately I lost the specimen before noting its position. 
What the cause may be of the extraordinary and almost constant perversity 
of the supernumerary spurs in 7’. speciosum I am unable to say. It may be in 
consequence of the spur encountering some obstacle resisting its direct elonga- 
tion; or it may be the result of some slight external injury to the point of the 
spur at an early period, leading to a reversal of the direction of the pouching. 
Anyhow, the phenomenon is a very remarkable one. In the three figures given 
I have omitted the partly withered petals and stamens present in the specimens 
as unnecessarily complicating the drawings, which, as they are, have sufficiently 
taxed my artistic powers. 
I would here acknowledge the liberality with which I have, from time to 
_ time, been supplied by kind friends with materials for the foregoing investiga- 
tion. My thanks are specially due to my former pupil, WM. Macraruang, Esq., 
| Killin, Perthshire, in which county 7. speciosum seems peculiarly at home; to 
| Dr W. H. Lowe, Balgreen, Edinburgh; and to Wm114M Caper, Esq., Waterside, 
| Dumfriesshire. I have to apologise to the Society for the long delay there has 
_ been in the publication of this paper, but I have been enabled thereby to make 
| my observations much more complete than they would otherwise have been. 








DESCRIPTION OF PLATES XIV., XV., AND XVI.* 
Explanation of the lettering of the fiqures. 

| Ob. Base of germ. mic. Micropyle, or region of same. 
ie. Carpel.. n. Nucleus of “aul 
| ch. Chalaza. plr. Placental root-process of germ. 
| ed. Endosperm. pv. Extremity of axile placenta, or arrested 
'emb. Embryo-proper. Punctum vegetationis of the floral axis. 
esr,  Extra-seminal root-process of germ. 8d. Anterior sepal. 
g. Germ. Se. Embryo-sae, or cavity of same. 
|v. Germinal vesicle. sl. Lateral sepal. 
Ch Hilum. Sp. Posterior sepal. 
| te; External integument of ovule. v. Normal posterior receptacular spur. 
| w. Internal do. y & z. Supernumerary receptacular spurs. 
Prats XIV. 
Tropeolum speciosum. 
! as 1. Longitudinal mesial section of ovarian lobe at the period of flowering, showing the hetero- 
| tropo-campylotropal ovule, with germinal vesicle in the embryo sac. A small portion of 
the tube of the style is seen, at the bottom of which is the somewhat conical apex of 
the axile placenta—the arrested punctum vegetationis of the floral axis. The fibro- 
vascular bundles are indicated (somewhat conventionally) by dotted shading. 
* The amplifications of the figures are, approximately, as follow :—Fig. 1, 45 times linear ; Fig. 3, 
250 times; Figs. 2, 4-10, and 21-23, 15 times; Figs. 11-17, 120 times. 
