ON COMMON DUNG BEDS. 29 



should be a sudden change in the weather, as 

 occurred on the night of the 12th of November 

 last ; air was then given at nine o'clock when it 

 was calm, and foggy, and the manure fermenting 

 rapidly; but at three in the morning of the 

 13th, it blew a gale, so the air was taken away, 

 by shutting down the lights at that hour. 



From the hillocks of earth, in which the 

 plants are planted, being small, the roots will 

 fill every part of them in a week or ten days ; 

 consequently about two inches of fresh earth 

 must be added round them. As the roots show 

 themselves, care is to be taken to keep up the 

 heat, by additions to, and turning the linings. 

 When the bed inside the frame becomes dry, 

 from the heat of the linings, let it be sprinkled 

 when the air is taken away in the evening ; and 

 this will cause a fine steam to rise, greatly bene- 

 ficial to the plants. For some years I conceived 

 that the plants were assisted in growth and 

 luxuriance by the steam which arose from the 

 well-prepared manure of the bed, more than 



