. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. M()S()rii"()Ks 1 •{•> Methods of extermination. It is luiiuiiiiic Inr us in nur work of exterininatini;' iiiostiuilofs that tlicv pass tliL* fust ilirce stages of life in water, and that the achilts innst conic to water to lay tlieir ej^gs, that is, nios(niitoes are strictly dependent upon suitable breeding- waters, in all successful campaigns undesirable [xxils in which mosquitoes may brec^d liave been drained or tilled. Streams and ponds have had their shores cleane(l of
. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. M()S()rii"()Ks 1 •{•> Methods of extermination. It is luiiuiiiiic Inr us in nur work of exterininatini;' iiiostiuilofs that tlicv pass tliL* fust ilirce stages of life in water, and that the achilts innst conic to water to lay tlieir ej^gs, that is, nios(niitoes are strictly dependent upon suitable breeding- waters, in all successful campaigns undesirable [xxils in which mosquitoes may brec^d liave been drained or tilled. Streams and ponds have had their shores cleane(l of weeds, bi'ush, and stumps, and haxc been graded so that ])ools were not left in which mostpiiloes could brei'(l aft(M' fi'cshets and storms. Tlien they have been stocked with lishes which feed u})on the young of mosquitoes. All water which was too tem[)()rary to drain or too polluted for fishes has been cov- ered with crude petroleum (one ounci- to fifteen square feet of surface). This treatment has been repeated as ohou as wrigglers have appeared. A mos(iuito can walk on the surface of water l)ut it cannot stand on oil ; hence, as all mos- ([uitoes come to the near-by water to lay their eggs, they soon perish, rrecautions liave been taken not to allow water to stand in tubs, barrels, or cisterns with- out being covered insect-tight. I'hrough systematic ap})licatiou of these methods, Tanama, Cuba, New Orleans, aiul many citifs in the north have effectually rid themselves of mosquitoes. The results of these campaigns ju'ove that the of the mosquito from any locality is no longer a matter (»f doubt or experiment. 'Hirough drainage of salt marshes whole. To. .lam hottlc iiiiii UiiiiltU'r arran«;f(l so ju* to secure t'i(^s of a single in(»si{uito. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the orig
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