46 



extremely fine shingle may be used. This affords opportuni- 

 ties for groping and hiding which many creatures indulge in. 



The floating shell-fish of the ocean, shell-fish of other kinds, 

 small crabs, &c. ; and small specimens of the numberless, 

 beautiful species of fish, beside more minute objects, would 

 afford ample material for study, and would be received with 

 delight in England. 



To import large specimens it will be necessary to keep them 

 in a bucket, or barrel, with plenty of air playing over it, a 

 daily change of water, and a shady situation. 



Frequent change of a portion, at least, of the water in the 

 globe aquaria will generally afford sufficient nutrition for 

 their occupants. If, however, feeding should be necessary, a 

 minute crumb or two of ship -biscuit may be dropped in the 

 water occasionally, for fishes. For crabs, prawns, &c., a tiny 

 piece of fish may be placed in the water for half an hour ; but 

 on no account should food of any kind be allowed to remain, 

 as it will contaminate the water more than any other cause. 

 Specimens that may die in the aquaria should, for the same 

 reason, be immediately removed. The best criterion of the 

 well-doing of an aquarium is the state of the water. If this, 

 when undisturbed, is quite clear, all is as it should be. If it 

 be at all obscure or discolored, it should be immediately 

 changed. 



METHOD FOR COLLECTING AND STUDYING 

 DESIRABLE. 



In order to make the most profitable use of such time and 

 labour as may be expended upon the subjects referred to in 

 these pages, it is strongly recommended to those who are at 

 fill earnest in the matter, to determine upon some method of 

 conducting their researches. It is not to be expected that any 

 persons will attempt to study deeply or collect largely, all the 

 classes of animals that have been here referred to. Some 

 more restricted plan will be generally necessary ; and it will 



