1 20 Researches respecting The Organizatidn of Leaves. 



aloe, which is composed of hexagonal utriculi, between 

 which appear several square apertures. These apertures, 

 similSir to those of the fritillaria, fig. 2, correspond to as 

 many conjugate utriculi which have remained on the paren- 

 chyme. The square form which these apertures constantly 

 aflectj seems to depend on that of the exterior utriculi. 



Fig. 14. This pellicle belongs to the leaf of the digitalis 

 purpurea: it consists of utriculi very much festooned, be- 

 tween which are seen the conjugate utriculi, the pores of 

 wh.ch seem to be obliterated by a black matter, which is 

 nothing else than air. 



The surface of this pellicle is furnished with some conical 

 hairs, very strong, and composed of several rings : they pro^ 

 ceed from the middle of the utriculus, as if they were a pro- 

 longation of it. 



Fig. 15. This figure represents the utriculi of the paren- 

 chyme of the leaf of the fritillaria : their form is nearly 

 spherical ; they are united to each other by a sort of pro- 

 longation in the manner of a neck, and separated in the rest 

 of their extent by pretty considerable vacuities, which have 

 a comm.unication with each other. To these vacuities I 

 have given the name of utricular ivterstkes. Each of these 

 utricuh is filled with a viscous juice, in which is fuund a 

 great number of small green globules applied to the mem- 

 brane of the utriculus : the upper ones appear more distinct, 

 and the lower ones fainter. 



The utriculus A is remarkable on account of the. bundle 

 of small prisms contained in its inside. 



In fig. 16 these prisms are seen insulated and larger. 



In fig. 1 7 is represented a different kind of these organs 

 found in the nenuphar. Its exterior side is covered with 

 points, and two ramifications proceed from its middle. 



Fig. IS. On account of the singular form affected by th6 

 utriculi which compose the parenchyme of a great number 

 of leaves, they have been called irregular j/triculi. From 

 their bodies proceed several arms in different directions, 

 which unite with similar prolongations of the other utri- 

 culi ; so that the parenchyme which they form becomes 

 Very lax, in consequence of the large interstices v>hich they 

 constitute. 



These utriculi were taken from the parenchyme of the 

 nectary of the narcissus. 



Fig. 19. This figure exhibits the pellicle of a petal the 

 utriculi of which rise above the surface in the form of co- 

 nical papillge, which produces a kind of dull velvety appear- 

 ance, rtmaiked in most petals, 



Fig. 



