It is not many years since Mr Ward first drew the attention of botanists to the cultivation of plants in closely-glazed cases; but the most sanguine dreams of the discoverer could not then have foretold the many useful purposes to which the Wardian Case has become applicable, nor the important influence which it was destined to obtain in promoting the pleasant pursuits of gardening and botany. The Wardian Case has been instrumental in diffusing a love of these pursuits among all classes of society. It has opened up to those whose pursuits confine them within the limits of the city's smoke-cloud, a means whereby they may obtain 'a peep at nature, if they can no more.' Far removed from green fields and leafy woods, they may, for instance, enjoy their leisure mornings in watching one of the most beautiful phenomena of vegetable development--the evolution of the circinate fronds of the fern; a plant in every respect associated with elegance and beauty. This kind of gardening has, therefore, become of late years one of the most fashionable, while at the same time one of the most pleasant sources of domestic amusement. An interesting companion to the Wardian Case has lately been presented in the Aquatic Plant Case, or Parlour Aquarium, due to the ingenuity of Mr Warington, and which has for its object, as its name indicates, the cultivation of aquatic or water plants. It may be described as a combination of the Wardian Case and the gold-fish globe, the object being to illustrate the mutual dependence of animal and vegetable life. Mr Warington has lately detailed his experiments. 'The small gold-fish were placed in a glass-receiver of about twelve gallons' capacity, having a cover of thin muslin stretched over a stout copper wire, bent into a circle, placed over its mouth, so as to exclude as much as possible the sooty dust of the London atmosphere, without, at the same time, impeding the free passage of the atmospheric air. This receiver was about half-filled with ordinary spring-water, and supplied at the bottom with sand and mud, together with loose stones of limestone tufa from Matlock, and of sandstone: these were arranged so that the fish could get below.... A small plant of _Vallisneria spiralis_ was introduced, its roots being inserted in the mud and sand, and covered by one of the loose stones, so as to retain the plant in its position.... The materials being thus arranged, all appeared to go on well for a short time, until circumstances occurred which indicated that another and very material agent was required to perfect the adjustment.' The decaying leaves of the vallisneria produced a slime which began to affect the fish injuriously: this it was necessary to get quit of. Mr Warington introduced five or six snails (_Limnea stagnalis_), 'which soon removed the nuisance, and restored the fish to a healthy state; thus perfecting the balance between the animal and vegetable inhabitants, and enabling both to