STEAM. 



30" 



veyed away. A more detailed description may be found 

 in the London Horticultural Transactions, vol. iii. 



Steam is sometimes employed to furnish bottom heat. 

 In the garden of Mr. Sturge, near Bath, a shallow cistern 

 of water is heated by a steam-pipe, in the manner exhibit- 

 ed the two following figures. The cistern is covered with 

 pavement, over which is a bed of small stones, then ashes 

 or sand, into which the pots containing plants are to be 

 pluDged. 



Fig. 25. 





HE 



*=a 



J 



Steam has also been employed to heat flues. The fol- 

 lowing figure represents a side view and section of a flue 

 filled with small stones or broken bricks, and heated by 



'Fig. 26. 



\ ■:■■■ 



means of a small steam-pipe passing along the lower part 



