266 ARTIFICIAL SEA- WATER. 



PedicelUna Belgica. These I cannot find, and I 

 therefore conclude that they have died out ; though, 

 if I chose to disturb the stones and weeds, I might 

 possibly detect them. These trifling defalcations do 

 in nowise interfere with the conclusion, that the ex- 

 periment of manufacturing sea-water for the Aquarium 

 has been perfectly successful. 



" P. H. GossE. 



" 58, Huntingdon Street, Bamsbury Park, 

 June 9, 1854." 



The small quantity of water thus experimented 

 upon remains up to this time (June, 1856), having 

 supported animal and vegetable life ever since with- 

 out interruption, a period of two years and two months. 

 It is as transparent as the day it was put in, rivalling 

 the water of the clearest rock-pool, from which it 

 can in no respect be distinguished, either in its 

 sensible qualities, or in its fitness for plants and 

 animals. Since that time I have made other and 

 larger quantities, with the same success ; so that 

 I can confidently recommend the formula for general 

 adoption. The salts are sold in packets, with all 

 needful directions, by Mr. Bolton, a chymist in 

 Holborn. 



It is interesting to find that the more subtile 

 constituents of sea-water, as Lime^ Iron, Silica, and 

 Iodine, which I neglect in my formula, are gradually 

 communicated to the artificial composition by use. 

 Dr. George Wilson, of Edinburgh, who has analysed 

 portions of each of my preparations, after several 

 months' use, finds traces therein of all these sub- 

 stances, according to a Heport on the subject, read at 



