Durable Number Tallies. 263 



Mr. Stewart's plan (Vol. I. p. 71.), only so arranging my fire- 

 place, that it would heat the boiler of my hot water apparatus 

 in the pit adjoining. By this plan, I have an excellent and. 

 steady heat produced at no expense; for I must have had a 

 perpendicular flue for my boiler, instead of which I have placed 

 it horizontalh', and applied the heat of the flue to the house. 

 Finding how well Mr. Stewart's pit worked, I, in part^ aban- 

 doned my lateral pipes, and have made (in my hot-house) 

 floors over the pipes, on his plan, filled with sand, and find 

 the whole to succeed in the most delightful manner imaginable; 

 the temperature of the sand being from 76° to 80°. The ad- 

 vantage of the hot water over the fire flues is, that you cannot 

 over-heat your sand, and the temperature is more uniform, and 

 will continue several hours after the fire is out. I think I can- 

 not be here out of place, in offering my best thanks to Mr. 

 Stewart, for the hint which his communication has afforded me. 

 It may be satisfactory to some of your readers to know, that 

 I have even made the water boil in the apparatus («) whilst 

 the valve was closed, so that only the lower pipes were at the 

 boiling point, and of course the water, to the top of the boiler, 

 but the upper range of pipes were almost cold ; the pipe {c) 

 was quite cold ; the pipe {b) received a slight portion of heat 

 close to the boiler, but I consider it to arise from absorption. 

 Whilst the apparatus was in this boiling state, I turned the 

 valve half round, and in six minutes both pipes were heated, 

 as well as a small reservoir attached to them at 7 ft. distance. 

 The hot water, therefore, displaced all the cold water in the 

 reservoir, and in 14 ft. of pipe, in the space of six minutes. 

 I am, Sir, &c. 



Robert Byers. 

 Mount Pleasant^ near Swansea, April 23. 



Art. VII. Notice of a durable Number Tally of Earthenijoare. 

 By Mr. William Anderson, F.L.S. H.S. &c. Curator of the 

 Chelsea Botanic Garden. 



Sir, 

 A DURABLE numbering tally has long been a desideratum 

 m the nurseries and botanic gardens. The late Mr. W. 

 Curtis, author of the Botanical Magazine, procured a label 

 of Wedgewood-ware ; it was very clean and showy, but did 

 not stand the frost. Within these two or three years, we have 



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