YARMO UTH A Q UARIUM. 1 67 



aeration by jets of atmospheric air is that it allows 

 of each tank to be treated independently of the rest, 

 if required. The Scarborough Aquarium is aerated 

 on the same plan as that at Brighton. Mr. Lloyd's 

 method of injecting sprays of water which carry down 

 fine air-bubbles to the bottom of the tanks, and then 

 allows them to be distributed through the volume of 

 water, however, has the support of all aquarium natu- 

 ralists. Undoubtedly the expense of constructing 

 storage reservoirs commensurate with the size of the 

 largest public aquaria is very great, if carried out in 

 the proportion of the method employed at the Crystal 

 Palace ; but if it be the means of preserving both 

 sea water and animals in a continually healthy 

 state, it cannot be deemed too great. Mr. Saville- 

 Kent states that as the show tanks of the aquarium 

 at Great Yarmouth are to hold 200,000 gallons of 

 water, "it would be necessary, in order to maintain 

 the same ratio in the reservoirs as obtained at West- 

 minster and the Crystal Palace, to construct reservoirs 

 large enough to hold no less a qantity than 1,000,000 

 gallons/' The Westminster Aquarium was con- 

 structed under the direction of Mr. Lloyd, and, as 

 already stated, it possesses show tanks of the capacity 

 of 1 50,000 gallons. To keep up the healthy circu- 

 lation of this water, after the manner described as 

 being in practice at Sydenham, there is storage 

 accommodation for 600,000 gallons, in underground 

 reservoirs which resemble three railway tunnels placed 



