Of Vegetation. 321 
fulphuL* and air, as we fee by Exper. 55, 
57, 58. which Seeds containing the rudi- 
ments of future vegetables, it was ncceffary 
that they fhould be well ftored with princi- 
ples that would both preferve the Seed from 
putrefaftion, and alfo be very adive in pro- 
moting germination and vegetation. Thus 
alfo by the grateful odours of f?owcrs we 
are allured, that they arc ftored with a very 
fubtile, highly fublimedOil, which perfumes 
the airibient air, and the fame may be ob- 
ferved from the high taftes of fruits. 
And as Oil is an excellent prefervative 
againft the injuries of cold, fo it is found 
to abound in the fap of the more northern 
trees 5 and it is this which in ever greens 
keeps their leaves from falling. 
‘But plants of a lefs durable texture, as 
they abound with a greater proportion of 
Salt and Water, which is not fo ftrongly, 
attrading as fulphur and air, fo are they lefs 
able to endure the cold 5 and as plants are 
obferved to have a greater proportion of Salt 
and Water in them in the fpring, than in 
the autumn, fo are they more eafily injured 
by cold in the fpring, than in a more advanced 
Y age. 
