6o 



all ordinary work and attend to him alone, 

 possible, this wonderful transfiguration. 



Fig. 21. — The life history of a dragon-ffy as seen in 



an aquarium. 



Each child should see, if 



Floating in the water 

 of a pond or stream are 

 queer little bundles of 

 grass or weed stems with 

 now and then a tiny peb- 

 ble clinging to the mass. 

 Close examination will 

 prove this to be the float- 

 ing dwelling of one of our 

 insect neighbors, the cad- 

 dice-worm. Contrasting 

 strangely with the untidy 

 exterior is the neat in- 

 terior, with its lining of 

 delicate silk, so smooth 

 that the soft - bodied 

 creature which lives in- 

 side is safe from injury. 

 The commonest of the 

 many forms of houses 

 found here are those 

 illustrated in figures 22 

 and 23. These will find 



Fig. 22. — Case of caddice-worm. 



all they wish to eat in a well- 

 stocked aquarium. When 

 full grown they will leave the 

 water as winged creatures, 

 like figure 24, and return to 

 it no more. 



There is surely no lack of 

 material furnished by Mother 

 Nature for the study of aquatic 

 life. Everyone who really 

 believes in its usefulness can 

 have an aquarium, and will feel well repaid for the time and eflFort 

 required when the renewed interest in Nature is witnessed which this 



Fig. 23. — An- 

 other c ad dice - 

 worm case. 



Fig. 24. — Caddice-jiy, 



