MR. WARINGTOn’s AQUARIUM. 
THE AQUATIC PLANT CASE, OE PAELOHE AQHAEIIJH. 
S EARLY two years since, ]Slr. Warington communicated to the Chemical Society the following 
interesting paper:— 
“ This communication will consist of a detail of an experimental investigation, which has been 
carried on for nearly the last twelve months, and which appears to illustrate, in a marked degree, that 
beautiful and wonderful provision which we see every where displayed throughout the animal and 
vegetable kingdoms, whereby their continued existence and stability are so admirably sustained, and 
by which they are made mutually to subserve, each for the other’s nutriment, and even for its indis¬ 
pensable wants and vital existence. The experiment has reference to the healthy life of fish preserved 
in a limited and confined portion of water. It was commenced in May, 1849, and the subjects chosen 
were two small gold fish. These 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 
them if they wished so to do. At the same time that the fish were placed in this miniature pond, if I 
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