INTRODUCTION. 253 



upon the greater or lefler degree of heat, fo that 

 flowers come forth proportion ably to thofe dif- 

 ferent degrees, but yet in fuch a manner, that 

 . one fpecics follows another in a regular order; 

 fmce 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 oeconomical 

 ufes, in fpite of all the afTitlance fiom altrono- 

 rners. 



Hence plants in different years often flower a 

 month fooner or later, although, as i obferved 

 before, they ftill follow one another in r'leir na- 

 tural order, as far as the fummer foLLice ; at 

 which time they hardly ever cvSrt: in any year; 

 and in the fame manner they proceed, haften on, 

 or are retarded, the nearer they approach towards 

 autumn, and the winter is farther off or nearer - 

 at hand. Now in order to determine accurately 

 the acceleration or retardation of the v/inter, we 

 muft obferve all the difi^erent kinds of flowers 

 in every place, at v/hat time they flrll appear, 

 and this daily, that the order v/hich 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 laft year, 1755, in the Upfal garden. I mufl: 

 obferve, that almofl: all the plants mentioned in 

 the following calendar grev/ 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 difiant, and which 

 are with difficulty railed in the garden. 



I have marked the month and day all along 



on 



