CRYSTAL PALACE AQUARIUM. 165 



the light of persons in a diving-bell, whose existence 

 depends on continuous pumping and injection of air." 

 The sea water issues from the pumps at the rate of 

 from five to seven thousand gallons an hour, passing 

 into the two largest tanks first. Thence it runs north 

 and south, passing into and feeding all the rest. The 

 sea water is unchanged, except about two per cent, of 

 the whole, which is added to compensate for leakages, 

 and one-half per cent, of fresh water, to supply the 

 loss by evaporation. 



Mr. Lloyd's method of employing large storage 

 reservoirs has lately been attacked by Mr. Saville- 

 Kent, in a paper read before the Society of Arts in 

 March, 1876, chiefly on the ground of its great ex- 

 pense, and also that so extensive a store of salt water 

 is not required.* At the Brighton Aquarium the tanks 

 are aerated by jets of air, injected into the water in 

 its simple form ; so that the mechanical arrangements 

 are quite different from those at the Crystal Palace. 

 Indeed, we may regard these two systems as being 

 more or less on their trial before the world. Each 

 has its merits, but that in practice at the Crystal 

 Palace has been longer in existence, and has never 

 shown signs of failure. At Brighton, moreover, the 



* Mr. Lloyd, in two contributions, one in the ' Journal of the Society 

 of Arts,' for March 24, 1876, and one in the ' Popular Science Review,' 

 for July i, 1876, has sought to demonstrate by figures that the money 

 capital of public aquaria cannot be more profitably spent than in large 

 reservoirs of from five to even ten times the aggregate capacity of the 

 show tanks. 



