10 HEDWIO ON THE ORGANS OF 



and branches, but also in the seed lobes, (PI. i. 

 Fig. i. 2.) and in the outer and inner covering of 

 flowers, generally called corolla and calyx. 



I now come to the perspirative pores connected 

 with the ducts just described. Those which I had 

 an opportunity of seeing were all oblong j but 

 when closed, their form was sometimes changed. 

 They all agree, however, in this circumstance, that 

 they occupy a variously shaped area, marked out 

 at least by a very faint line. This area is some- 

 times round, as in the leaves of the pink, some- 

 times oval (Fig. i. 2. 3. 4.), or rhomboidal, as 

 in the Indian corn, or square, as in the variegated 

 and other aloes, in Cactus curassavicus, &c. 



Thefe, as also their oblong apertures, generally 

 take the longitudinal direction of the leaves, with 

 this exception, that where the lymphatic vessels do. 

 not purfue direct routes (as mentioned above) de- 

 viations will take place with respect to them also. 

 In such cases, they will incline more or lefs to the 

 left or right, and sometimes even assume an hori- 

 zontal position. 



The above-mentioned adhering portions of the 



