THE FIRST BOOK OF BOTANY. 

 SCHEDTTLE SEVENTEEN, DESCRIBING FIG. 143. 



LEAF. Simple, petiolate, exstipulate, feather- 

 veined, entire, cordate, sub-acuminate. 



EXEECISE XXVII. 

 Color, Surface, Size, Structure. 



COLOR. Stems may be spotted, striped, green, 

 brown, red, or purple. 



SURFACE. The surface of stems, like that of 

 leaves, is smooth, rough, shiny, dull, hairy, and 

 glabrous. 



SIZE. - Sterns may be high or low, slender or thick, 

 and it is easy to determine these points. 



STRUCTURE. To find out the structure of a stem, 

 you must break it, and observe first whether it is 

 hollow or solid. Next examine it to ascertain if it 

 have any tenacious threads ; these are woody fibres, 

 and, when present, they help to make the stem hard 



