invented by John Pe'nn, Esq.^ LemsJiam. 1 25 



the laps of the glass or by the occasional opening of the door, 

 since the strawberry plants were introduced. Some queen pines 

 had ripe fruit, and one of them being cut and tasted, Mr. Wilmot 

 pronounced it to be far superior in flavour to any queen pine 

 that he had ever tasted at this season of the year. See Mr. - 

 Wilmot's letter, which forms the succeeding article. 



3. A great saving of heat in the case of forcing all trees or plants 

 which can be trained on walls or trellises, and in the case of 

 ornamental stove trees or shrubs that can be so trained. The 

 manner in which this can be effected is, by planting the trees 

 against a perpendicular wall or trellis, or against a wall or 

 trellis with any required degree of slope, and covering the wall 

 or trellis with glass ; the border having a vacuity underneath it, 

 so as completely to isolate the roots, and admit, by the general 

 arrangement already described, of a constant circulation of warm 

 moist air between the glass and the wall, between the upper sur- 

 face of the border and whatever covering may be placed over 

 it, and underneath the border. In consequence of this arrange- 

 ment, a very small volume of air requires to be heated, while the 

 circulation of the air is more certain of passing through among 

 the leaves, blossoms, and fruit. The border where this system 

 is adopted may either be covered with a boarded roof at the dis- 

 tance of 1 or 2 feet from the soil, or with glass sashes at the 

 same distance ; and, in the latter case, the surface of the border 

 may be used as the surface of a hot-bed, and pots of strawber- 

 ries or other plants set on it to be forced, or sown or planted in 

 it to be grown. The only disadvantage attending this arrange- 

 ment is, that the trees trained against the wall can only be ex- 

 amined by persons outside the glass, and, consequently, that when 

 they are to be watered or pruned the glass must be removed. 

 Even in large houses or pits, where pots of strawberries or kid- 

 neybeans are placed immediately under the glass, only a stratum 

 of ] or 2 feet in depth will require to be heated ; and, by arrange- 

 ments, that object can easily be effected. For example, a tempo- 

 I'ary flooring of boards under the plants trained, or under the 

 pots of strawberries or kidneybeans, with the joints made air- 

 tight by strips of paper or canvass glued on, would be sufficient. 

 In some cases, a bed of earth, which might serve as the border 

 for roots of vines or peaches, would render this temporary floor- 

 ing of boards unnecessary. 



4. All the plants, including cucumbers, which were in fruit, and 

 some shrubs which were in flower, were in remarkably vigorous 

 health ; so that the circulation of the air, independently of all 

 other circumstances, seems to produce a positive benefit to the" 

 plants. The blossoms of the Persian lilac, when forcing, are 

 generally without fragrance, but Mr. Wilmot and ourselves 

 found that this was not the case here. In short, as Mr. Wilmot 



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