174 OUR PUBLIC AQUARIA. 



of organic matter, as well as immense numbers of the 

 zoospores of sea-weeds, and is, in fact, what Dr. Car- 

 penter aptly terms it, in the "condition of a very 

 weak broth." Indeed, this " weak broth " is all the 

 food the marine foraminifera, sponges, and many 

 other lowly-organised animals have to feed upon. Sea- 

 anemones, sea-worms, sea-squirts, sea-mats, &c., come 

 in for a share of it, so that the quantity of solid food 

 required to be artificially conveyed to many of them 

 is very small. 



