. The animans and man; an elementary textbook of zoology and human physiology. .Aquaria.—For the breeding of aquatic insects aquariaare needed. As the ordinary rectangular aquaria are ex-pensive and are liable to leak we use glass vessels instead. Small aquariacan be made of jelly-tumblers, glass fin-ger-bowls, and glassfruit-cans, and largeraquaria can be ob-tained of good substitutefor these is what isknown as a battery-jar (fig. 240). Thereare several sizes ofthese, which can beobtained of mostdealers in scientificapparatus. To prepare anaquarium, place inthe jar a layer ofsand; p
. The animans and man; an elementary textbook of zoology and human physiology. .Aquaria.—For the breeding of aquatic insects aquariaare needed. As the ordinary rectangular aquaria are ex-pensive and are liable to leak we use glass vessels instead. Small aquariacan be made of jelly-tumblers, glass fin-ger-bowls, and glassfruit-cans, and largeraquaria can be ob-tained of good substitutefor these is what isknown as a battery-jar (fig. 240). Thereare several sizes ofthese, which can beobtained of mostdealers in scientificapparatus. To prepare anaquarium, place inthe jar a layer ofsand; plant somewater-plants in this sand, cover the sand with a layerof gravel or small stones, and then add the requiredamount of water carefully, so as not to disturb the plantsor to roil the water unduly. The growing plants will keepthe water in good condition for aquatic animal life, and renderchanging of the water unnecessary, if the animals in it livenaturally in quiet water. Among the more available plantsfor use in aquaria are the following:Waterweed, Elodea FIG. 240. Battery-jar aquarium. UlIf u REARING AND COLLECTING ANIMALS 473 Bladderwort, Utricularia (several species).Water-starwort, Callitriche (several species).Watercress, Nasturtium officinale. Stoneworts, Char a and Nitella (several species of each).Frog-spittle or water-silk, small quantity of duckweed, Lemna, placed on thesurface of the water adds to the beauty of an aquarium. When it is necessary to add water to an aquarium onaccount of loss by evaporation, rain water should be used toprevent an undue accumulation of the mineral-water heldin solution in other water. Making collections.—Much is to be learned about ani-mals by collecting them. But the collecting should bedone chiefly with the idea of learning about the animals ratherthan with the notion of getting as many specimens as collect, it is necessary to find the animals alive; one learnsthus their haunts, their local
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Keywords: ., bookcentury1900, bookd, booksubjectphysiology, booksubjectzoology
