Organization of Leaves. 1 1 9 



Vex : it exhibits a very sensible thickness, which is not found 

 in the other iaces. 



The conjugate utricuh are seen in the direction of their 

 height and of their small diameter. They are united by 

 their extremities, and as they are seen shortened they ap- 

 pear under the form of two spherical bodies applied to each 

 other : they are not united to the utriculi of the paren- 

 chyme, and therefore a considerable vacuity, which esta- 

 blishes a communication between the pore and the utricular 

 interstices, is found below them. 



Fig. 8. This figure is a repetition of fig. 3. It exhibits a 

 very thin slice cut vertically in the direction of the length 

 of the leaf^ but it is seen under a scale of proportion much 

 larger. 



The conjugate utriculi which are seen in the direction 

 of their height and large diameter mutually conceal each 

 Other ; so that only one of these utriculi is seen on its la- 

 teral face, covered by that of the exterior utriculus to which 

 it is united. 



Fig. 9. This figure represents the pellicle of maize, and 

 exhibits an exception in regard to the pores which belong to 

 the family of the gramineous plants. No pores indeed are 

 seen; and the conjugate utriculi, which are found lodged 

 in a kind of square area produced by the disposition of the 

 exterior utriculi, instead of being rcnlform as in the other 

 plants, are cylindric, and applied to each other by their cy- 

 lindric faces, in such a manner as to conceal every appear- 

 ance of pores. At their extremity is seen a small circle, 

 which is closed, as far as I could ascertain, by the juice 

 contained in these utriculi. 



The exterior utriculi, the form of which is a very elon- 

 gated parallclopipedon, have their large sides festooned, and 

 their small sides straight or rectilinear. 



Fig. 10. This figure shows more distinctly than fig. 5 

 how the lateral faces of the exterior utriculi exhibit them- 

 selves under the appearance of vessels which form a kind of 

 reticulation, the meshes of which are here hexagonal in con- 

 sequence of the hexagonal prismatic form of the utriculi. 



Fig. 11 and 12, The conjugate utriculi represented in 

 these two figures evidently differ from those seen in fig. 9, 

 though found in the same plant, either in the leaves which 

 .surround the ear, or in the mterior face of the sheath of the 

 leaves. In fig. 11 the 'pore begins to appear, because the 

 utriculi become a little rcniform ; and in fig. 12, where 

 they are entirely so, the pore is very cvidLnt. 



fi^. 13. Thia figure shows the p'eUicle uf the leaf of tlic 

 H 4 idoc^ 



