At the commencement of forcing, half the chamber is filled longitudinally with dung, and if the doors are kept shut, this will afford sufficient heat from twelve to eighteen days. As the heat declines the other half of the chamber is filled, and the temperature is kept up by additions to the top of the dung, on either or both sides, as it settles. When the united heat of the two sides ceases to be sufficient, the side first filled must be cleared out, and mixed with fresh dung and replaced, and so on, adding and turning as circumstances require. _Hort. Trans._ iv. 220. [Illustration: 24] As an improvement on the construction of this pit, we would suggest the perforation of the whole of the side walls (_fig. 24. a_), in order to admit the steam more readily than it can find admittance by the single range of openings adopted by Mr. West. Where pits on Mr. West’s plan are already built, a substitute for this perforation in the side walls may be found in the application of a wattled hurdle against them (_fig. 24. b_), as has been adopted by Mr. J. B. Mackay, in the Comte de Vande’s garden at Bayswater. _Remarks._--All the schemes of improvement detailed in this section, are either of a nature never to become general, if they do succeed, as that of Count Zuboff; or not yet sufficiently proved by experience to be recommended for adoption, as the application of steam as a bottom heat by Mr. Hay. We therefore leave them to work their way with the public; and, in the mean time, till these, as well as Mr. Knight’s experiments have established something better, we recommend all those who wish to grow the Pine Apple in the first style of excellence, and at a moderate expence, to adopt the pits and houses of Mr. Baldwin or Mr. Aiton; and to imitate their practice, or that of Mr. Andrews. THE END. LONDON: Printed by A. & R. Spottiswoode, New-Street-Square. Transcriber’s Notes Except as mentioned below, this text follows the original book in spelling and hyphenation, including inconsistencies. In some places the quote marks do not match; this has not been corrected.