_General management._ In this, Mr. Oldacre has nothing particular; he is careful not to let the temperature of either frames or pits, containing Pine plants fall under 60° in winter, but is not afraid of a heat of 90° or 100° in summer. After shifting, and occasionally during very hot weather, he shades the plants in the frames and succession-pits, well knowing that the want of abundant and extended roots must lessen that supply of moisture essential to the vigour of plants, during high sunshine, when evaporation is so powerful. His fruiting-plants he keeps in large pots, rather broad than deep, and so liberally supplies them with water, that evaporation and transpiration go on even in the hottest sun-shine, without injuring the plants. He waters often with liquid manure, generally the drainings of dunghills; frequently steams the house by watering the paths and flues when the steam apparatus is not at work; sometimes he waters the plants over the top; and at all times he keeps up a good bottom heat. It may be further noticed, that in the hottest weather, from June to September, he permits the temperature of the atmosphere of the house to rise to upwards of 100 degrees during the day, but leaves sufficient number of sashes open during the night, to lower the heat of the air within very nearly to that of the air without. This is perfectly natural treatment, consistent with what takes place in those countries where the Pine Apple is grown in the open air, and consonant with the practice of Mr. Knight. _Insects._ These he keeps off by regimen, watering with clear water, and filling the house with steam. In short, Mr. Oldacre’s opinions and practices, as far as circumstances have required practice, are in perfect unison with Mr. M’Phail’s: and it is not, perhaps, too much to assert, that experience will bring every gardener to the same result. _Fruit produced._ Mr. Oldacre considers that the fruit he produces in the copper-roofed house is never so high-flavoured as that grown in the other with a timber roof, though the treatment be in all other respects the same. This certainly appears a very singular circumstance, and not to be accounted for in the present state of human knowledge. The bars of iron, or copper sashes, might possibly (but not probably) make some difference in the electrical state of the air of the house, but this is the utmost degree of variation we can conceive a metallic roof capable of making. If it admits more light, or abstracts more heat, these are effects easily counteracted, if desired, and must have been so, if they existed in any degree, as Mr. Oldacre asserts the culture in both houses was exactly alike.