. 



'I* 



Of Vegetation. 337 



vcficlcs arc always dry ; in which date wc 

 may plainly obfcrvc every vcficlc to be ^on- 

 traded at each end by a Diaphragm or Sphin- 

 cter, whereby its too great lateral dilatation 

 isprevented, but not its diftenfion length wife. 



And as this pith in the quill grows dry 

 and ufclefs after the quill is full grown, 

 we may obfervethe fame in the pith of trees 

 which is always fucculcnt and full of moifture 

 while the (hoot is growing, by, the expanfion 

 of which the tender duftile (hoot is diftended 

 in every part, its fibres being at the fame time 

 kept iupple by this moifture 5 but when 

 each year's ihoot is full grown, then the pith 

 gradually drys up, and continues for the 

 future dry and kikfey, its veficles being ever 

 after empty ; nature always carefully pro- 

 viding for the fucceeding year's growth by 

 preferving a tender du&ilc part in the bud 

 replete with fucculent pith. 



And as in vegetables* fo doubtlefs in ani- 

 mals, the tender du&ile bones of young 

 animals are gradually incrcafed in every part, 

 that is not hardened and offified ; but fmce 

 it was inconfiftent with the motion of the 

 joynts to have the ends of the bones foft 



and du&ile as in vegetables} therefore na- 



Z ture 





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