INTRODUCTION, 21 



degree, in every fucceeding year, month, or day. 

 But it may be obferved, that the difproportion is in 

 general greater in the open air, than in that of the 

 cucumber frames, efpecially in the 'winter and fpring 

 months. 



In my journal I have given the degrees of heat? 

 according to the thermometer, in the open air in the 

 fhade, at different hours of each day, for twelve 

 months. The thermometer hung on a nail, whie h was 

 driven into a brick wall, having a north afped, and 

 the fouth fide of it covered from the dired rays of 

 the fun by a thicket of fhrubs. The ground at this 

 place lies on a declivity to the north, about one mile 

 northward of Addington hills, which are barren of 

 every vegetable, except heath of different forts. 

 Snow lies here for a fhort time after it is melted in 

 the adjacent country ; and the garden crops are later, 

 by eight or ten days, than they are in fome parts, 

 only about four or five miles diftant : This, I appre- 

 hend, is occafioned by the nature of the foil, which 

 is various, even in the fame field ; fome being a 

 fandy loam, fome a cold clay, and fome gravelly, 

 and underneath in fome parts is flrong clay, in other 

 parts fand and gravel, and fome parts are fpringy. In 

 this part of the country, it is but feldom that the 

 thermometer falls below 20, or rifes above 80 : 

 It vv'ould, therefore, feem that the medium heat is 

 about 50, 



I have often tried the heat of the fprlngs in this 



part of the country, and I never found them make 



the mercury in the thermometer fall below 44, nor 



B 3 raife 



