to pkeface. 



Thirdly, I have faid fomething about the 

 quantity and quality of water requifite for its 

 nourilhment, and have exhibited the ill confe- 

 quences arifmg from giving too much or too 

 little, and I have mentioned what degree of heat 

 and temperature the water fhould be of when it 

 is moft proper for the nourifhment and growth 

 of the plants. 



Fourthly, I have pointed out the neceffity of 

 fupplying the plants at all times with frefh fweet 

 air, and have flidwn the bad confequences re- 

 fulting from their being fupplied with contami- 

 nated or impure air ; and I have given direc- 

 tions how to prevent unhealthy air from getting 

 into the frames among the plants, as well as 

 how to prevent impure air from being generat- 

 ed in the frames. 



Fifthly, I have mentioned the method I take 

 in making and managing the linings, fo that the 

 air in the frames m.ay be kept up to a proper 

 degree of heat, and fufnciently fupplied with ve- 

 getCitive moifture : I have fet forth the necef- 

 fity of covering up the frames at nights, and re- 

 commended that particular attention fhould be 

 paid thereto, and have laid down my method 

 of covering and of uncovering. 



Sixthly, I have defcribed my method of flop- 

 ping the plants, and of keeping them regularly 



thia 



