4i8 



PRODUCTION 



Sect. XV. 2- s 



550 



n 



ears, (Communications to Board of Agriculture, Vol. I. p. 

 which it may effeS: both by relaxing the cuticle of the grain, and 



internal abforption of the mucus or flarch 



the too great 



preventing 



depofited in the cells of it ; and laflly by fupplying it with more nu 



triment. 



There are two circumflances to be attended 



& 



a 



plants ; which are, not to water them during the hot part of the d 



fummer, nor in the evenings of fpring, wh 



frofl may be ex- 



accom 



pe6led ; in both thefe circumftances we may be faid to copy 

 as rain is generally preceded by a cloudy iky, and is never 

 panied by frofl:;* though that fometimes follows it, and is then very 

 injurious to vegetation. 



W^hen plants have been long ftimulated by 



h 



•- 



funfli 



violent a61ion, if this film 



of heat be too greatly and too fud 



denly diminifhed by the affufion of cold water, or by its fudden eva- 

 poration, their veflels ceafe to a6:, and death enfues ; exadly as has 

 too frequently happened to thofe, who have bathed in a cold fpring of 

 water after having been heated by violent and contii 



continued exercife on 



a hot day. When fevere froft follows the watering of plants, they 

 are rendered torpid, and die by the too great and fudden diminution 

 of the flimulus of heat ; which is equally neceffary to the aclivity of 

 vegetable as to animal fibres ; and in fome inflances the circulation 

 of their fluids may be flopped by the congelation of them; and in 

 others their veflels may be burft by the expanfion attending the con- 

 verfion of water into ice; or laflly, by the feparation of their different 

 fluids by congelation. See Se<5l. XV. 4. i. 



When an addition of manure can be procured, as where the black 



bo 



J 



from a dunghill mixed 



with water, or foap-fud 



hich have been ufed in wafh 



t> 



be employed inflead of 



mufl: undoubtedly add to the nutriment, and confequently 



I . 



enlarge 



/ 



