338 Of yegetation. 
ture makes a wonderful provifion for this 
at the glutinous ferrated joyning of the heads 
to the {hanks of the bones j which joyning 
tvhile it continues dudile the animal grows, 
but when it oflifies then the animal can no 
longer grow. As I was aflured by the following 
Experiment, viz. I took a half grown Chick, 
whofe leg-bone was then two inches long, 
and with a (harp pointed Iron at half an inch 
diftance I pierced two fmall holes through the 
middle of the fcaly covering of the leg, and 
shin-bone; two months after I killed the 
Chick, and upon laying the bone bare, I 
found on it obfeure remains of the two 
marks I had made at the fame diftance of 
half an inch: So that that part of the bone 
had not at all diftended lengthwife, fince 
the time that I marked it : Notwithftandin^ 
the bone was in that time grown an inch 
more in length, which growth was moftly 
at the upper end of the bone, where a won- 
derful provifion is made for its growth at the 
joyning of its head to the fhank, called by 
Anatomifts Symphyfis. 
And as the bones grow in length and fize ; 
fo muft the membranous, the mufclar, the 
4 nervous. 
