io8 Fresh Water Aquarium 



of the fishes is the most important. In 

 enumerating the many different varieties the 

 practical side only is considered, the scientific 

 classification being of less importance to the 

 aquarist, than the knowledge of treatment 

 and the selection of the varieties, which can 

 live together without damage to one another. 



The beginner has to face certain questions 

 which are not easily answered. In the first 

 place, he has to be very careful in the selec- 

 tion of his fishes, so that their size may be 

 in proportion to the size of the aquarium. 

 Then the individual requirements of the 

 different varieties, — as to food, temperature 

 and light have to be considered, and care has 

 to be taken, that a sufficient amount of 

 oxygen is provided, as the lack of this all 

 important element is more fatal to fishes than 

 almost any other form of neglect. 



The answer to the very important ques- 

 tion about the selection of such fishes as may 

 be placed together in the same aquarium de- 

 pends upon the conditions under which they 



