^44 Of Vegetation* 
to the fibrous Mace of Nutmegs, the ends of 
whofc hairy fibres are inferted into the an- 
gles of the furrows in the Walnut-fhellt 
Their ufe is therefore doubtlefs to carry in 
thofe long diftind veflels thq very vifeous 
matter which turns, when dry, to a hard 
fheli 3 whereas were the fhell immediately 
nourifhed from the foft pulpous hull that 
furrounds it, it would certainly be of the 
fame foft confutation : The ufe of the hull 
being only to keep the fheli in a foft dudile 
date till the Nut has done growing. 
We may obferve the like effed of a flower 
motion of the fap in Ever-greens, which per- 
fpiring little, their fap moves much more 
{lowly than in more perfpiring Trees 5 and 
is therefore much more vifeid, whereby they 
are better enabled to outlive the winters 
cold. It is obferved that the fap of Ever- 
greens in hot Countries is not fo vifeous as 
the fap of more Northern Ever-greens, as 
the fir, &c. for the fap in hotter Countries 
muft have a brisker motion, by means of 
its greater perfpiration* 
Experiment CXXIV. 
In order to enquire into the manner of 
the fxpanfion of leaves, I provided a little 
Oaken 
