30 6 



LIGHT, HEAT, 



Sect. XIIL 2. 2. 



ground behind the young plants, and fupported a few inches over 

 them in front by poles placed horizontally over the rows ; remem- 

 bering the old proverb. 



s 



The wind from north-eaft 

 Deftroys man and bead ; 



The wind from fouth-wefl 

 Is always the bed. 



V 



The immediate caufe of the coldnefs of the N. E. winds is, th 



they confifb of 



of 



jng ice 



d 



brought from the north over evaporat 



o 



apparent eafterly direct 



becaufe they 



part of the furficeof the earth, which moves with 



& 



S 



city, than the furface of the part of the earth, they come from, 

 on the contrary the S.W. winds are warm, as they confift of regions 

 of air brought from the fouth, and gain an apparent weflerly direc- 

 tion, becaufe ihey arrive at a part of the earth^s furface, which moves 

 flower than the furface nearer the equator, whence they came, and 

 of which they had previoufly acquired the velocity. 



As the common heat of th 



th 



HI 



thofe tend 

 from the 



mate is 48 d 



o 



which will bear bending down, are eafily fecured 



; fro ft by fpread 

 them with ftraw or fern. 



them 



pon 



th 



D 



Th 



d, and coverincr 



particularly fuits fig-trees, as they 



ery flexible, and as they are furnifhed with an acrid juice, which 



defends them from infeds ; but I have neverthelefs found th 

 this fituation much eaten by mice 



em 



b 



It has been believed by many, that froft meliorates the ground 



known 



o 



pa 



as 



y 



was formerly fuppofed ; and that though froft by enlarging the bulk 

 of fome moift foils may leave them more porous for a time after the 



th 



yet 



the water exhales, the foil becomes as hard as bef 



being prefTed toe 



obfervation of M 



ther by the incumbent atmofphere. • 



Kirwan's, mentioned in Sedion XV. 4 



And from 



P 



pears 



> 



\ 



