ARTIFICIAL SEA- WATER. 17 



" These throve and flourished from day to day 

 manifesting the highest health and vigour; the 

 plants (including one or two Red Weeds that were 

 introduced with the animals) looked well, and the 

 water continued brilliantly crystalline. Within 

 the succeeding month, specimens of ^c^mi'a mesem- 

 hryanthemum^ A. anguicoma and A. clavata, a Tro- 

 chus umhilicatKs, and a Littorina littorea, were at 

 different times added. 



*' Six weeks have now elapsed since the intro- 

 duction of the animals. I have just carefully 

 searched over the jar, as well as I could do it 

 without disturbing the contents. I find every one 

 of the species and specimens mentioned above, all 

 in high health ; with the exception of some of the 

 Polyzoa, viz. Crista aculeata, Cellepora jmrntcosttf 

 Cellularia ciliata and PedicelUna nelgica. These 

 I cannot find, and I therefore conclude that they 

 have died out ; though if I choose to disturb the 

 stones and weeds, I might possibly detect them. 

 These trifling defalcations do in no wise interfere 

 with the conclusion, that the experiment of manu- 

 facturing 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 to this time (April, 1856), having 

 supported animal and vegetable life ever since 

 without interruption, a period of two years. 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 

 C 



