. HOT WATER. 331 



nions of horticulturists respecting its merits, as appli- 

 cable to the forcing garden, are still divided, and as it 

 has not as yet stood the test of much experience, it may 

 be sufficient to give it this cursory notice. For further 

 information, however, we may refer to the G-ardeners 

 3Iagazme, vols. viii. and ix. 



Mr. Corbett, foreman at Poptey's nursery garden, 

 Plymouth, introduced a mode of employing hot water as 

 a means of heating. Erom a common boiler proceeds an 

 upright tube, and this tube leads to a continued series of 

 open gutters. Heat being applied to the boiler, the water 

 jises in the tube and flows forward in the gutters, giving 

 out moisture in proportion to the degree of heat. As 

 the water cools or becomes more dense or heavy, it 

 gradually falls back 'to the bottom of the boiler. 



Mr. Rendle, of Union Road Nursery, Plymouth, has 

 also introduced a mode of heating, in which he employs 

 tanks instead of pipes, or gutters, for both surface and 

 bottom heat. These tanks are formed of wood, brick, 

 stone, or cast-iron. Wheu formed of wood, they re- 

 quire to be made of good sound plank, not less than 

 two inches thick, properly jointed, and are usually 

 covered with slates. If they are formed of stone or 

 brick, the insides require a thick coating of Roman 

 cement, and for covers, stone, slate, or brick- pavement 

 is employed. The cast iron tanks have corners of the 

 same materials. 



When only ane' tank is fitted up in a house or pit, a 

 division is made along the centre, leaving an opening at 

 the end farthest from the boiler, for the water to flow 

 through, tlie hot water or flow pipe from the boiler 

 being fixed to the end of the tank on one sido of the 

 division, and the cold water or return pipe to the boiler 



