STEAM, 65 
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. 
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. 
a 
