STEAM. oOj 



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 

 plunged. 



Fig. 25. 





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 



