OR, THE HOME-CULTURE OF FRESH-WATER PLANTS. 



qualities of a real lake. The vessel must, however, 

 above all things, be placed where it will receive a 

 sufficiency of light, for without that vivifying influ- 

 ence neither the Aquarium, nor even the natural lake 

 itself, could carry on its interesting processes. It 

 is in the sunshine, indeed, that some of the most 

 beautiful phenomena involved in the creation of 

 oxygen by the plants are exhibited, especially when 

 the bubbles of the newly emitted gas rise quivering 

 to the surface, displaying, with beautiful variations, 

 all the colours of the prism. 



