ANIMAL STUDY 1 97 



Fish are, perhaps, the leas,t desirable of all the animals 



suited to aquaria. One or two very small 

 Fish 



fish may be desirable during seasons when 



other material is scarce. 



The price of success in all work with the aquarium is 

 extreme care against overstocking with animals which take 



oxygen directly from the water. For the 

 Caution 



best practical results use several vessels 



having capacities of from one to six quarts, rather than one 

 large aquarium. As young forms, such as tadpoles, de- 

 velop, remove all but two or three of each kind, as crowded 

 conditions and insufficient food are fatal to good results. 

 Food supply is very important with the young of all ani- 

 mals. Once started, the whole care of the aquarium may 

 be given over to trusty pupils. 



THE INSECT CAGE 



The rearing of insects in an insect cage is much simpler 

 than the caring for animals in an aquarium; consequently, 

 the former is better adapted to work with young children, 

 although its value is just as great with older pupils. 



The cages may be very simple, a flower pot with a wire 

 cover, a small box or a glass jar with a little slightly moist 



earth in the bottom, or a more elaborate 

 The Cage , , 



affair made for the purpose. A good form 



for the latter is a rectangular box, two feet long, one foot 

 wide, and sixteen inches high, with space in the bottom 

 for a tray three inches deep for soil. The sides may be of 

 glass, and, to secure ventilation, the ends may be of wire 

 screen. The lid should be on the top and hinged; it may 



