330 Memoirs (>f the C'dlcdoiiian Ilorticullurdl Soc/r/ij. 

 1, J 



a, Stage for plants. b. Arched wall for support of stage. r. Arched wall and back flue. 



*/, liaised walk, or gangway, in front of stage. <-, Arche«l wall for sui)i><)rt of walk. 



/, Arched wall and front flue. ir, Peach trellis. A, Stone for support of peach trellis. 



i. Made border for vines : it is 14 ft. wide, ,0 ft. deep at back, and 3 ft. at front. Here the vines 



arc planted against the back wall, and trained down the rafters, one branch to each, on the 



spur mode of pruning. 

 k. Peach border within and without the front wall. • 



* Front shelf, for forcing strawberries, &c. 



72. Account nf a Mode of 'producing a steady and uniform Bottom 

 Heat in Pint-apple or Melon Pits, or in Stoves for Exotic Plants, 

 by means of Steam introduced into a close Chamber jilled ivith 

 iVater-ivorn Sto7ies. By Mr. John Hay, Planner, Edinburgh. 

 Read March 5. 1829. 



We liave already (Vol. V. p. 443. and A50.) noticed this 

 important improvement in exotic cnlture ; anil stated that 

 the first idea of applying steam to the heatin<>- of hot-house.s 

 occurred to Mr. Hay about the year I79t. In 1807, a pine- 

 stove was designed and executed for the Duke of Northum- 

 berland, at Alnwick Castle, by Mr, Hay, in which a chamber 

 below the bark-bed was filled by stones heated by steam ; but, 

 as the pipes and supply of steam were too small for the mass 

 of stones, the use of this mode of heating was in this instance 

 not long continued. Mr. Hay did not, however, lose sight 

 of the principle; and accordingly, in 1818, applied it in small 

 jnnc-pits at Castle Semple, and in pine-stoves at Bargany. 

 About the end of the year 1820, Mr. Hay .says: — 



