All bark-stove plants require a great deal of water when they are in a growing state, and, as it is necessary that the water should be of the same temperature as the house, there should be either an open cistern in the house, or a cistern in the shed behind, near the furnace, and communicating with the house by a pipe. The best plan is to have a cistern in the house, as it can be used as an aquarium; and there are many beautiful tropical aquatics, such as the different species of Nymphæ'a and Nelúmbium, which deserve growing for their beauty, while others are interesting for their curiosity, such as the Papyrus. In summer, bark-stove plants require very little care, except to prevent them from receiving any sudden check, as, if the heat be not kept up regularly, the plants are very liable to stop growing, and, when the heat is renewed, to shoot a second time, and thus to waste their strength in sickly and imperfect growth. Great care is also required in autumn to increase the fire heat in proportion as the weather grows cold, so as to prevent the plants from receiving any check from the decrease of temperature in the atmospheric air, as tropical plants may be said to have only two seasons, viz. summer and winter; and thus they should be kept as nearly as possible at the same heat as long as they are in a growing state; and then have a complete change to a season of rest, by never letting the heat rise higher than from 60° to 65° during the dark days of winter. During the winter months very little air can be admitted, on account of the great difference between the air of the atmosphere and that within the house; but in the spring, advantage should be taken of every warm day, even in March and April, to open the sashes a few inches wide for half an hour or an hour in the middle of the day, when the sun shines; but the house should be shut up immediately if the sun should go in and the air become chilled. As the summer advances, air should be admitted freely, and continued till the beginning of September, when it should be gradually reduced till the cold of winter prevents any being given at all. Most gardeners repot, or shift, as they call it, all their bark-stove plants about the middle or end of April; but this is too indiscriminate a practice, and, therefore, only those should be repotted that appear to want such an operation.