APPENDIX. 441 



recorded in the preceding pages, they may do both by 

 visiting the Zoological Gardens in the Regent's Park. The 

 able and zealous Secretary, D. W. Mitchell, Esq., has 

 already set up one large glass tank, filled with sea-water, 

 (the purity of which is maintained in the manner I have just 

 described,) and stocked with marine plants and animals 

 so as to resemble one of those charming tide-pools, so often 

 mentioned in these pages, with the advantage of having its 

 sides formed of plate-glass, and its whole contents there- 

 fore clearly visible. There the visitor may see the Sahelke, 

 the ActinicB of brilliant hues and many kinds, Mollusca both 

 shelled and naked, Crustacea^ and Annellida^ all pursuing 

 their various avocations and enjoying themselves without 

 restraint, under circumstances scarcely distinguishable 

 from those of nature. All who have seen this aquarium 

 concur in considering it a most attractive exhibition ; and 

 it is fairly anticipated that when seven other tanks of 

 equal dimensions are added to the one already stocked, 

 each containing some of the numerous tribes of marine 

 creatures (a result which we hope to accomplish in the 

 course of a few months), the whole will form one of the 

 most unique and interesting features of these beautiful 

 Gardens. 



But my attention has been directed to the realization of 

 such a desideratum as I have before mentioned (See p. 234, 

 ante) a Marine Aquarium for the Parlour or Conservatory. 

 An apparatus for this purpose has been for some time in 

 the manufacturer's hands ; and though there are some 

 minor difficulties attendant on the mechanical part of the 

 execution, they are not such as to throw any material 

 doubt on my confident expectation, that in a short time an 

 elegant vase stocked with algae and sea-anemones, and 

 comprising within itself the elements of its constant self- 

 purification, will be before the world. 



