14G 



FHOCKKUINGB OV TIIU 



iMay 5, IHR). 



OllDINARY MEETING. 



I'lio following were elected FellowH of the Society ; 



The Lfuiy (^renville, Dropinore. Hiu ks. 

 'riioiiias Clarke, Kscj., F.S.A., -l.-J, Craven Street, Strand, 

 aiul lli^lii;ate. 



Mr, (leor^e C unnin^ham, Nurseryman, Wavcrtree, Liver- 

 pool. 



\\\ S. Gillctt, Esq., M..\., 25 Guildford Street, Russell 

 Scjuare. 



Mr. Thomas Jackson, Nurseryman, Kingston. 

 .Tohn Russell Reeves, Es(|., Clapham Rise. 

 \\'illiani Scholey, Esq., Claphani. 



The reading of Mr. Rogers' paper on Heating with Hot 

 Water, was concluded. 



The author commenced by observing, that on the whole there 

 appears no doubt that the circulation of hot water in iron pipes 

 is the best means hitherto devised for heating Horticultural build- 

 ings. Its peculiar advantages are the uniformity and durability 

 of the heat so communicated, and its perfect and equable distribu- 

 tion to all parts of the building. But whether it is capable of 

 eflfecting any considerable economy of fuel, will depend much upon 

 the construction of the apparatus. Where this is well-con- 

 structed and well-managed, the saving of fuel may amount to 

 25 per cent, over well-constructed and well-managed flues ; but 

 in the opinion of the author, in a large proportion of the appara- 

 tus now in use, it will be found that the consumption of fuel 

 greatly exceeds that of common furnaces. 



The author next proceeded to comment upon the general de- 

 sire of gardeners, to possess an apparatus that will get up heat in a 

 short time, and upon the value of the ordinary test of excellence in a 

 hot water apparatus, by inquiring how speedily water can be made 

 to boil. Upon this Mr. Rogers observed, that where an apparatus is 

 properly constructed this can seldom be effected without a most 

 extravagant waste of fuel. The water in a hot water apparatus, 

 constructed on the most perfect principles, will take as many 

 hours to heat to the boiling point as the pipes which contain it 

 are inches in diameter, and it will also cool in the same ratio. 

 Four inch pipes will accordingly take four hours to reach the 

 temperature of 200" ; and they can be heated to the boiling point 

 in one hour, only by the consumption of four times as much fuel 

 as would suffice if properly applied, or in fact, allowing for the 

 waste of heat by the chimney, which increases under such cir- 



