THE STOCK. 271 



water of a broTsni line. From tlie Red and tlie Green 

 orders we must make our selection. 



Of the former tliese will be found good : BhytipliIcBa 

 'pinastroides^ the Polysijjlionice, Corallina officinalis, 

 Delesseria alata, Gracilaria confer voides, Gelidium 

 corneum, Polyides rotiindus, Chondrus crisjons, Plujllo- 

 jphora ruhens (this, especially when dredged from deep 

 water, is one of the very best), the GriffithsicBj and 

 some of the Callitlicimnia. 



Of the Green weeds, Codium tomentosum does pretty 

 well, and affords food for some Mollusca that will eat 

 nothing else. The Cladoplioi^cB are good ; Bryojwis 

 plumosa^ a most elegant little plant, flourishes in con- 

 finement ; but the Enter omorplics. and JJIvcb. are pro- 

 bably 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 attached 

 should be as clean as possible. All adhering Sponges, 

 in particular, should be carefully scraped off, unless 

 they are wanted for immediate examination ; as they 

 are almost sure to die, and corrupt the soil and water 

 with sulphuretted hydrogen, — a most nauseous and 

 noxious gas, which tm-ns everything black with which 

 it comes into contact. 



Animals. — Of the animals which thrive best in an 

 Aquarium (speaking, of course, only from my o^ti 

 limited experience and observation), the following may 

 be mentioned : — 



Fishes. — The smaller Sticklebacks ; young speci- 

 mens 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 



