206 



THE SECOND BOOK OF BOTANY. 



sents a greatly-magnified section of the Indian reed. 

 At the left you see cellular tissue, or parenchyma ; 

 then annular and spiral vessels, dotted ducts, and 

 fibres. 



FIG. 374. 



Again, Figs. 375 and 376 are drawn from sections 

 of the wood of the plane-tree. In Fig. 376 you see 

 the open mouths of the ducts, which are shown ver- 

 tically in Fig. 375. 



EXPERIMENT. To observe the coiled threads upon 

 the walls of vessels, tear gently the young shoots of 

 the rose-bush or elder, or carefully pull asunder the 

 petiole, or one of the veins of a strawberry-leaf, just 

 breaking the cuticle, and only stretching the internal 

 parts. Or, even, if the parts are quite separated, you 

 may see with the naked eye, at the point of fracture, 



