THE STOCK. 19 



Red and tlie Green orders we must make our 

 selection. 



Of the former these will be found good. Wiyti- 

 pJilcea pinastroides, the Polysiplwnicje, Coratlina 

 officinalis, Delesseria alata, Chondrus crisjms, Phyl- 

 iophora ruhens (this, especially when dredged from 

 deep water, is one of the very best) ,the Griffithsiae, 

 and some of the Callithamnia. 



Of the Green weeds Codium tomentosum does 

 pretty well, and affords food for some Mollusca that 

 will eat nothing else. The CladopliorcB are good ; 

 Bryopsis plumosa, a most elegant little plant, 

 flourishes in confinement ; but the Enter omorjyhae 

 and Ulv(B are probably the best of all sea-weeds 

 for our purpose, and the most easily procm*ed on 

 every shore. 



The pieces of rock to which the plants are at- 

 tached should be as clean as possible. All adhering 

 sponges, in particular, should be carefully scraped 

 off, unless they are wanted for immediate examina- 

 tion ; as they are almost sure to die, and corrupt 

 the soil and water with sulphuretted hydrogen, a 

 most nauseous and noxious gas, which turns every- 

 thing black with which it comes into contact. 



Animals. — Of the animals which thrive best 

 in an Aquarium (speaking, of course, only from 

 my own limited experience and observation) the 

 following may be mentioned : — 



Fishes. — The smaller Sticklebacks ; young 

 specimens of the Grey Mullet, which have lived 

 for more than three years in the Zoological Society's 

 Aquarium ; the Blennies and Gobies ; the Spotted 

 Gunnel ; the smaller Wrasses ; the Eocklings ; the 

 Flounder ; the Dab ; the Eels. 



Mollusca. — The Sea-hare; the Periwinkle; the 

 C2 



