Of Vegetation. 349 
things the work of vegetation feemed to be 
wholly at a ft and, at lcaft within the reach 
of the froft. 
But when the cold was fo far relaxed, as 
to have the fpirit in the firft Thermometer 
but 5 degrees above the freezing point, the 
fecond 8 degrees, and the 6th 13 degrees, 
tho’ it was ftill very cold, yet this being fome 
advance from freezing towards warm, and 
there being confequently fome expanfion 
of the fap, feveral of the hardy vegetables 
grew, viz. fome Ever- greens, Snow-drops, 
Crocus’s, &c. which forward hardf plants 
do probably partake much of the nature of 
Ever-greens in perfpiring little ; and the mo- 
tion of their fap being confequently very 
flow, it will become more vifeous, as in 
Ever-greens 5 and thereby the better able tc» 
refill the winter’s cold : and the fmall expan- 
five force, which this fap acquires in the win- 
ter, is moftly exerted in extending the plant, 
little of it being wafted in proportion to 
the fummer's perfpiration. 
Supported by the evidence of many of the 
foregoing Experiments, I will now trace the 
vegetation of a tree from its firft feminal 
plant in the Seed to its full maturity and pro- 
duction of other Seeds, without entring into 
4 a parti- 
