272 



VEGETABLE 



cantia,} in Indian Corn, and the White Lily, this net-work 

 consists of waved lines forming parallelograms by communi- 

 cating with each side of the ends of the oval pores ; Fig. 

 241 represents their form and appearance highly magnified, 



Fist. 241. Fig. 242. 



in the leaf of the White Lily, and Fig. 242, in that of Indian 

 Corn. 



These pores, in different forms, exist on both sides of the 

 leaves of almost all herbaceous plants, the Grasses, the Lilia- 

 ceous plants, and the Palms. In the leaves of trees, and 

 shrubs, they are found only on the under surface, and in 

 aquatics, the leaves of which float on the water, the upper 

 surface only is furnished with them. Leaves which are en- 

 tirely under water have no pores, although those on the same 

 p?ant, which are in the air, have them. 



As descriptions of the forms under which these reticula- 

 tions appear in different leaves, would be useless, we can 

 only give figures of them; with the names of the plants on 

 which their appearance is similar. 



Fig. 243 represents the meshes as they appear on the un- 



Fia. 243. Fig 244. 



der surfaces of the leaves of the Sage, Holyhock, Chestnut, 

 Horse-Chestnut, Oak, Sumac, Walnut, Pear, Grape-Vine, 

 and Poplar. The same appears on the upper surface of the 

 Palmated Rhubarb, (Rheum palmatum,} and on both sur- 

 faces of Plantago vulgaris. Aster trifolium, and many other 

 herbs. 



Fig. 244 shows the form of the pores and connecting vessel* 



