FOREIGN AQUARIA. 1 7 



tank, wherein the animals obtained fresh air either by 

 pumping it in, or by the natural aeration of plants. 

 If the tanks were large, however, it was found that 

 the latter system was attended with a good deal of 

 difficulty. Hence the large tanks were usually aerated 

 by causing the water to circulate and be injected in 

 sprays, or else jets of air were forced into the water, 

 which thus came into contact with oxygen, at the 

 same time giving up its carbonic acid. The interior 

 of the large tank in the Havre Aquarium was fitted 

 up with rockwork, so as to resemble Fingal's Cave, 

 in Staffa. Similar devices, all of them in bad taste, 

 have been adopted at the Brussels, Hanover, Boulogne, 

 Berlin, and Cologne aquaria. 



The first of those large public aquaria, which have 

 lately grown to such colossal proportions, was that 

 opened by the French Acclimatisation Society, in the 

 Bois de Boulogne, in 1861. Its length is 150 feet, 

 and it is fitted up with fourteen tanks, each of which 

 contains two hundred gallons of water. Ten tanks 

 are devoted to fresh- water objects, and four to marine. 

 The aquarium at Hamburg, opened in 1864, has also 

 been very successful. It has long been considered 

 one of the best on the Continent ; much of its 

 success depending upon the fact that Mr. William 

 A. Lloyd was the deviser, and for some time the 

 curator. Under his able management the zoological 

 department attracted a good deal of attention among 

 naturalists. In Great Britain we have hitherto been 



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