24 



BOTANY. 



(b) Study similarly tte stony tissue of the cocoanut, walnut, 

 peach, cherry, etc. 



(c) Make cross-sections of the seed-coat of the apple, squash, 

 melon, wild cucumber (Bchinocystis), etc. It is instructive to make 

 sections, also, parallel to the surface of the seeds. 



(d) Make longitudinal sections of the pith of apple-twigs and note 

 that some of the cells have thickened walls. These are very hard, 

 and are to be regarded as a form of stony tissue. They contain 

 starch. 



Fto. 14.— Stony tissue. A, from shell of Hickory-nut ; B and 0, from 

 underground stem of the common Brake (Pterls). Magnified 400 to 5(M 

 times. 



42. Fibrous Tissue. — This is composed of elongated, 

 thick-walled, and generally fusiform fibres (Fig. 16), whose 

 walls are usually marked with simple or sometimes bor 

 dered pits. These fibres in cross-section are rarely square 

 or round, but most generally three- to many-sided. They 

 are found in, or in connection with, the woody bundles of 

 ferns and flowering plants, and give strength and hardness 

 to their stems and leaves. 



