LIFE IN THE OCEAN. 6 1 



in a closed cylinder placed below the level of the aquarium, makes 

 it ascend, and enter with great force into a reservoir, into which it is 

 thrown from a small jet. The sea water thus pressed absorbs a 

 portion of the air, which is drawn Avith it into the reservoir. A tube 

 placed in a corner of the reservoir receives the overflow, and 

 conducts it into a closed carbon filter, whence it passes into a gravelly- 

 underground reservoir, returning again to the closed cylinder. The 

 water is once more subjected to the pressure of air, and again 

 ascends to the aquarium. The cylinder being underground, a 

 temperature equal to abour i6° Centigrade, which is nearly the 

 uniform temperature of the ocean, is easily maintained. During 

 winter the aquarium is heated artifically. 



We ought not to conclude our remarks on this subject without a 

 passing allusion to the large aquarium at the Sydenham Palace, and 

 to the still larger one more recently opened at Brighton, which, for 

 abundance of specimens and tastefulness of arrangement, far surpass 

 anything of the sort previously attempted in England. 



