104 



APPENDIX 



not be allowed to become dry, neither should it be soaked 

 with water." For further and full instructions, see " Insect 

 Life," pp. 326-335. 



AQUARIA. For the breeding of aquatic insects aquaria 

 are needed. 



" Small aquaria can be made of jelly tumblers, glass finger 

 bowls, and glass fruit jars, and larger aquaria can be ob- 

 tained of dealers. A good substitute for these is what is 

 known as the battery jar (Fig. 9). There are several 

 sizes of these, which can be obtained of most dealers in 

 scientific apparatus. 



FIG. 10. Plants for an aquarium; a, parrot's leather; b, water purslane; 

 c, water starwort ; d, e, stoneworts ; /, waterweed, 



" To prepare an aquarium, place in the jar a layer of 

 sand; plant some water plants in this sand; cover the 

 sand with a layer of gravel or small stones ; and then add 

 the required amount of water carefully, so as not to dis- 

 turb the plants or to roil the water unduly. The growing 

 plants will keep the water in good condition for aquatic 

 animal life and render changing of the water unnecessary. 



