AETIFICIAL SEA-WATER. 265 



have the advantage of it, before the entrance of 

 animal life. This, too, is the order of nature ; plants 

 first, then animals. 



" A coating of the green spores was soon deposited 

 on the sides of the glass, and bubbles of oxygen were 

 copiously thrown off every day under the excitement 

 of the sun's light. After a week, therefore, I ven- 

 tured to put in animals as follows : — 



2 Actinia mesemhryantJiemum. Coryne ramosa. 

 7 Serpula triquetra. Crisia ehurnea. 



3 Balanus halanoides. ,, aculeata. 



2 Sahella ? Cellepora pumicosa, 



2 Sabellaria {alveolata ?) Cellularia ciliata. 



2 Spio vulgaris. Bowerhankiaimhricata, 



1 Cynthia [quadrangular is ?) Pedicellina Belgica. 



" These throve and flourished from day to day, 

 manifesting the highest health and vigour ; the plants 

 (including one or two Red Weeds that were intro- 

 duced with the animals) looked well, and the water 

 continued brilliantly crystalline. Within the suc- 

 ceeding month, specimens of Actinia mesemhryantlic- 

 mu7n, A. anguicoma, and A, clavata, a Trochus umhili- 

 catus, and a Littorina littorea were at different times 

 added. 



" Six weeks have now elapsed since the introduc- 

 tion 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. Crisia 

 aculeata J Cellepora pumicosa^ Cellularia ciliata^ and 



