OF SEA- ANEMONES. G9 



tubing of gutta-percha, passing the tube through the 

 centre of the lower vessel, and affixing to it a nozzle 

 of glass or ivory, the stream from which may be 

 regulated by a stop-cock placed between the two 

 receptacles. The salt-water, whether manufactured 

 or taken from the sea, being thrown into the upper 

 trough, will then descend, and, rising through the 

 glass tube, will form a miniature jet tVeau, and every 

 atom of water will thus be thoroughly aerated and 

 purified before it reaches the anemones. The over- 

 flow may be received in a lower tank and carried up- 

 wards by hand, or by a forcing-pump, ad infinitum. 

 Two cautions are necessary : one to let the cement 

 become perfectly " dead" before the tanks are used ; 

 the other, to let all the water run off from the tank 

 which contains the anemones about once a fortnight, 

 when its sides and base should be thoroughly 

 cleansed. Artificial rocks, pieces of coral and the 

 like, may be fixed in this tank with cement as soon 

 as it is placed in position. If the reader is fond of 

 long words, and wishes to dignify his tank with an 

 appropriately specific name, he may call it his 

 " AcTiNiAEiuM," though tliis, too, is not necessary 

 to the well-being of its contents. 



The ivater for our tank, or glass, or pan, is the 

 next consideration. If we live near the sea, of 

 course fresh sea- water is advisable ; let the whole, 

 or a goodly portion, of the contents be drawn off 

 about once a week, and a fresh supply added till the 



