286 culinary gardening. book i, 



2. Forcing, by removing vegetables into an arti- 

 ficial climate, is performed by means of glass-houses, or 

 glass-cases, heated either by fuel fire, the heat of steam, or the 

 heat of putrefaction or fermentation. In every case, the great 

 art lies in imitating natural climates as to light, dew, rain, heat, 

 air, wind, &c. — For the modes of accomplishing this object, 

 see the next chapter. 



CHAPTER VI. 



OF THE CONSTRUCTION OF HOT-HOUSES, HOT-WALLS, PITS, 

 HOT-BEDS, AND MUSHROOM- HOUSES. 



That the construction of hot-houses is very imperfectly un- 

 derstood among those who are generally employed to erect 

 them, will appear evident to any one who shall investigate the 

 subject in the slightest manner. Nor will this appear surpris- 

 ing, when we consider how very recently they have become 

 general in gentlemen's gardens. It is presumed that there were 

 few green-houses in England before Mr. Evelyn erected his con- 



