Of Vegetation . 
And as this pith in the quill grows dry and 
ufelefs after the quill is ful 1 grown, we may o!> 
ferve the fame in the pith of trees, which is al- 
ways fucculent and full of moifture while the 
flioot is growing, by theexpanfion of which 
the tender dudile flioot is diftended in every 
part, its fibres being at the fame time kept 
fupple by this moifture 5 but when each year's 
flioot is full grown, then the pith gradually 
drys up, and continues for the future dry and 
kikfey, its veficles being ever after empty 5 na- 
ture always carefully providing for thefucceed- 
ingy ear’s growth by prcferving a tendcrduc- 
tilepartin the bud replete with fucculentpith- 
And as in vegetables, fo doubtlefs in ani- 
mals, the tender dudile bones of young 
animals are gradually increafed in every part, 
that is not hardened and oflified $ but fince 
it was inconfiftent with the motion of the 
joynts to have the ends of the bones fofc 
and dudile as in vegetables j therefore na- 
ture makes a wonderful provifion for this 
at the glutinous ferratcd joyning of the heads 
to the flunks of the bones ; which joyning 
while it continues dudile the animal grows, 
but when it offifies then the animal can no 
longer grow. As I was allured by the following 
Experiment, viz, I took a half grown Chick, 
Z z whole 
