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 diff"erent 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 lias been more 

 studied and is better understood, prove of immense benefit to 

 the scientific cultivator." 



The plant now represented appears to be nearest to 

 /. campanulata, from which it difi^ers 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 /. 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 Goodeniacese, and, a fortiori^ the 

 well known rim found upon the stigma in Ericaceae, 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 his figures of Impatiens grandis 

 and iimhellata. 



