useful to any one who may again attempt to subdivide it, 
and is, in the meantime, in a physiological point of view, ex- 
ceedingly curious. It is, that most of the species from the 
colder regions of the Himalaya mountains correspond with 
the European I. noli tangere, in the form and dehiscence of 
their capsule, that is, they split from the base, rolling the 
segments towards the apex, while those of the warmer regions 
split from the apex and roll their segments towards the base. 
This difference of habit between those of India Proper and 
the Himalayan forms is well worthy of notice, as it shows, 
that the affinity which exists between the flora of the latter 
and that of Europe, is stronger than between it and the 
Indian, and extends to even this most purely tropical genus. 
« The innate power which plants enjoy of selecting the 
soil and climate in different countries, however remote, most 
suitable to their perfect development, and which the pre- 
ceding remarks have shown to be so eminently possessed by 
those of this order, may, when the subject has been more 
studied and is better understood, prove of immense benefit to 
the scientific cultivator.” 
The plant now represented appears to be nearest to 
I. campanulata, from which it differs in inflorescence, in its 
flowers being yellow not cream-coloured, and in the dorsal 
sepal having a spur in the middle of its back. It derives its 
name of “ three-horned” from the spur, the horn just men- 
tioned and the apex of the back sepal together forming three 
conical processes. 
Connected with these plants is a point of structure de- . 
serving of attention. In J. macrochila it will be found that 
the style is surrounded below its apex by five points,* which 
are evidently continuations of the backs of the carpels, (see 
fig. 3, t. 8.). What are these points? It appears to me that 
they are only the points of the carpellary leaves, which cer- 
tainly in these plants are separate from the placenta, and 
are merely pressed down upon it so as to cover the ovules, 
thus confirming the accuracy of the views concerning placen- 
tation held by Schykofsky and Schleiden. If so, what else 
_ can the upper part of the style and the stigmas be, except the 
naked apex of the placenta, prolonged beyond the carpellary 
leaves? And then is not the conducting tissue of a style in 
most cases an extension of the placenta? and may we not 
consider the indusium of Goodeniacex, and, a fortiori, tbe 
well known rim found upon the stigma in Ericaces, as the 
expanded end of the carpellary leaves, while the stigma of 
those plants is the upper end of the placenta? These are 
points well worthy of investigation. 
* These are also shown by Dr. Wight in hi j andis 
aid ls y Dr. Wight in his figures of Impatiens gr 
