Heating Horticultural Buildings. 



103 



mens may be produced. The best pines I have ever seen, 

 speaking generally, not of two or three extra fruit, the mere 

 things of accident, were growing in a pit almost the same as 

 shown by this plan. They were, however, in the hands of 

 a first-rate gardener, and were a good stock when put into it. 

 In judging of the merits of these two plans, it must not be 

 forgotten, that the flue occupies a much larger space than the 

 pipes, and that the objections mentioned above to the old sys- 

 tem apply, dryness excepted. 



Fig. 9, is the section of a house just erected by a nursery- 



Fig. 9. Section of a Propagating or 

 Forcing House. 



a Tanks of brick and cement, 18 inches 

 wide, and 2 inches deep, connected 

 with the boiler by pipes ; they are 

 covered to the first line with coarse 

 rubble, over which there is tan, [or 

 saw-dust,] for plunging the plants. 



b Flue. 



c Walk. 



man in this neighborhood; it is 70 feet long and 14 wide, 

 and promises to be an exceedingly useful house. The heat- 

 ing apparatus, as you will perceive, cost a mere trifle, if I 

 recollect aright, about twenty-five pounds, (one hundred and 

 twenty- five dollars.) The part next the boiler is used for 

 propagation, and fully answers the purpose. The flue has a 

 damper, so that when it is not wanted the heated air may 

 at once ascend by the chimney : this must always be the 

 case where the flue is not required at all times that the tank 

 may be needed. 



I might add much to what I have already said in favor of 

 the tank system ; but as I have no wish to be ranked among 

 enthusiasts, I thing it better to leave it to your readers to 

 judge for themselves, and let experience decide more fully 

 of its merits. 



London. Decem^ber, 1844. 



The above excellent article, by one of our London corres- 

 pondents, is worthy of particular attention ; and individuals 

 who are erecting greenhouses, or structures for plants, will 



