200 



MANURES. 



Sect. X. 2; 8. 



3 



crop can be thus obtained, as no mgre plants can rife perpendicularly 

 from the ground j but In the ripening of grain the furface of air to 

 which the ears are expofed is alfo to 

 ponds with the furface of the ground 



be 



(idered ; which corref 



d In hill and d 



But th 



f 



d is increafed by its be 



o 



bjedion to this mode of 



ploughing In molft fituations without fufficient declivity, as the corn 

 in the furrows appears weak and backward owing to the rain lylno- 

 on it too long ; and alfo to the beft part of (hallow foils beino- fre- 

 quently taken from them to conftrud the ridges. See Sedt. XVI. 



2. 2. 



8. Add to this, that the evaporation of molfture from the furface 

 of the earth produces fo much cold as to Injure thofe terreflrlal plants, 

 which are too long covered with it. On this account thofe parts of 

 wall-trees, which are fheltered from the defcending dews by a copli 

 ftone on the wall, are not fo liable to be injured by fro fly nights < 



o 



both as they are not made colder by 



poration 



of the dew, and alfo have lefs water to be congealed in their vefTels, 

 and by its expanfion to burfl: them. 



9. Laftly, the foliage on buds of plants, which conftitute one part 

 of their progeny, requires more molfture for its vigorous growth, than 

 their flowers or organs of fexual generation. Hence In warm coun- 

 tries the rice-grounds, are flooded only till the feafon of flowering 

 commences, and are laid dry again for the purpofe of maturating the 

 feed ; and In our climate continued rains are liable not only to wafli 



ivs, and thus prevent the im- 



ofFthe fa 



from the burfting anth 



pregnatlon of the piftillum, but alfo to delay the ripening of the fruit 

 or feeds from the want of a due evaporation of their perfplrable mat- 

 ter, as well as from the lefs folar light In cloudy feafons ; whence In 

 the north of Scotland the 

 commences with the dry feafon, which accompan 



oats are faid feldom to ripen till the froft 



\ 



10. 



Th 



methods of p 



or 



prel4 



th 



falutary 



moIAure of the foil befides thofe of 



and aquedu(fls, which 



fhould 



/ 



