192 GLAUCUS; OE, 



from any chemist to whom Mr. Gosse has entrusted 

 his discovery, and, according to his directions, make 

 sea-water for yourself* 



One more hint before we part. If, after all, you 

 are not going down to the sea-side this year, and 

 have no opportunities of testing " the wonders of the 

 shore," you may still study JsTatural History in your 

 own drawing-room, by looking a little into "the 

 wonders of the pond." 



I am not jesting ; a fresh-water aquarium, though 

 by no means as beautiful as a salt-water one, is even 

 more easily established. A glass jar, floored with 

 two or three inches of pond-mud (which should be 

 covered with fine gravel to prevent the mud washing 

 up); a specimen of each of two water-plants which 

 you may buy now at any good shop in Covent 

 Garden, VaUisneria spiralis (which is said to give to 

 the Canvas-backed duck of America its peculiar 

 richness of flavour), and Anacharis alsinastrum, that 

 magical weed which, lately introduced from Canada 



*■ Mr. W. Bolton, Chemist, of 146, Holbom Bars, London, or 

 Mr. Lloyd, will furnish the materials. 



