“Being satisfied with my success in the above-mentioned experiment, of having totally destroyed the insects on these plants without hurting them, I hesitated not to begin to water the whole of the plants under my care, whenever they wanted it, all over their leaves and fruit, with water about 85 degrees warm. This process I continued to practise for several months, during which time I do not recollect that the thermometer was ever below 70, and in sunshine it was raised sometimes to upwards of 110 degrees. I continued this practice longer perhaps than was absolutely necessary, but I was determined to destroy the whole of the insects in the house, whether on the plants, or in the tan, or in any part of the house; and this I certainly did accomplish effectually. Thus, by this easy, and not unnatural, mode of management, the plants became perfectly free of insects; they were perfectly cleansed of all filth; they grew vigorously; and the fruit swelled fine to a good size. After this I had several times Pine Apple plants from abroad, and out of hot-houses at home, full of insects, which, by the means that I have, without reserve, described, I effectually destroyed, and made the plants grow very fast indeed.” “If Pine Apple plants be kept in a strong vigorous growing state by giving them plenty of heat, and water applied occasionally all over their leaves, whether they be in frames heated with dung, or in hot-houses heated by a fire, a few insects will do them little hurt. But if the methods which I have given for cultivating the Pine Apple plant be adopted, I am persuaded all sorts of injurious insects natural to these sorts of plants will disappear on them. “When we see human creatures lean in body for want of a sufficiency of wholesome food, or, for want of cleanliness, lice and fleas breed upon them; and poverty in cattle for want of food has the same effect on them. Similar causes in vegetables has a similar effect, so that when Pine Apple plants are in a state of poverty, for want of a sufficiency of good earth, or of heat, or of water, insects natural to them, if there be any of them in the hot-house, will breed rapidly on them and hurt them. Those insects which naturally breed and live on the Pine Apple plant, appear to delight in a dry dirty situation. Where Pine Apples grow naturally and produce large fruit, they are not free of insects; and though plants be free of insects, they will not grow well, nor produce fine fruit, unless they get enough of good earth, sufficient heat, and be watered plentifully.”