INTRODUCTION. 253 
upon the greater or leflfer degree of heat, fo that 
flowers come forth proportionabiy to thofe dif- 
ferent degrees, but yet in fuch a manner, that 
one fpecies follows another in a regular order 5 
flnce this is the cafe, i fay, the feafons of the 
year, and particularly the fummer, may eafily 
from thence be meafured; which hitherto has 
been a defideratum, on account of (Economical 
ufes, in fpite of all the affiftance from aftrono- 
mers. 
Hence plants in different years often flower a 
month fooner or later, although, as i obferved 
before, they ftill follow one another in their na- 
tural order, as far as the fummer folftice ; at 
which time they hardly ever differ in any year ; 
and in the fame manner they proceed, haften on, 
or are retarded, the nearer they approach r.o wards 
autumn, and the winter is farther off or nearer 
at hand. Nov/ in order to determine accurately 
the acceleration or retardation of the winter, we 
muft obferve all the different kinds of flowers 
in every place, at v/hat time they Aril appear, 
and this daily, that the order which they obferve 
may be better afcertained. 
By way of fpecimen i have exhibited the flow- 
ers in the fame order in which they appeared 
the lafc year, 1755, in the Upfal garden. I muft 
obferve, that almoft all the plants mentioned in 
the following calendar grew in the open air, and 
in the fame kind of foil, which is rather low and 
loamy, excepting about half a fcore, which were 
gathered in the woods not far diftant; and which 
are with difficulty railed in the garden. 
I have marked the month and day all along 
on 
